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Pagon RA, Adam MP, Ardinger HH, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2014.

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Congenital Hepatic Fibrosis Overview

, MD, , MD, PhD, and , MD.

Author Information
, MD
National Human Genome Research Institute
Medical Genetics Branch, Section on Human Biochemical Genetics
Intramural Office of Rare Diseases
National Institutes of Health
Bethesda, Maryland
, MD, PhD
Clinical Director, National Human Genome Research Institute
Medical Genetics Branch
Section on Human Biochemical Genetics
National Institutes of Health
Bethesda, Maryland
, MD
Investigator, Liver Disease Branch
National Institute of Diabetes and Digestive and Kidney Diseases
National Institutes of Health
Bethesda, Maryland

Initial Posting: .

Summary

Disease characteristics. Congenital hepatic fibrosis (CHF) is a developmental disorder of the portobiliary system characterized histologically by defective remodeling of the ductal plate (ductal plate malformation; DPM), abnormal branching of the intrahepatic portal veins, and progressive fibrosis of the portal tracts. CHF may or may not be associated with macroscopic cystic dilatation of the intrahepatic bile ducts. Clinical findings include enlarged, abnormally shaped liver, relatively well-preserved hepatocellular function, and portal hypertension (PH) resulting in splenomegaly, hypersplenism, and gastroesophageal varices. Pulmonary hypertension (portopulmonary hypertension) and vascular shunts in the pulmonary parenchyma (hepatopulmonary syndrome), complications of PH, can also be seen rarely. Most frequently CHF is associated with ciliopathies (disorders of the primary cilia) that have associated renal disease, the so-called hepatorenal fibrocystic diseases (FCDs). Although the hepatorenal FCDs are currently classified by phenotype, it is likely that gene-based classification will be quite different in the future because of the tremendous genetic and phenotypic overlap between these disorders.

Diagnosis/testing. CHF is typically diagnosed by finding increased echogenicity of the liver parenchyma with or without macrocysts on ultrasound examination; MRI including magnetic resonance cholangiopancreatography (MRCP) may also be used. Liver biopsy is rarely required. The multisystem syndromes associated with hepatorenal FCDs are diagnosed by physical examination or other specialized studies, family history, and molecular genetic testing.

Genetic counseling. The syndromes associated with CHF are most commonly inherited in an autosomal recessive manner; however, X-linked and autosomal dominant inheritance are also observed. Genetic counseling depends on accurate determination of the specific genetic diagnosis.

Management. Treatment of manifestations: No therapies can repair the primary ductal plate malformation or reverse the fibrosis or biliary tree abnormalities. Complications of CHF, including variceal bleeding, hypersplenism, cholangitis, and, to a lesser extent, biliary stones, cholangiocarcinoma, and hepatocellular carcinoma, are treated in a routine manner.

Prevention of secondary complications: immunization for hepatitis A and B.

Surveillance: Monitor growth rate in children; screen for gastroesophageal varices and hepatopulmonary syndrome when the platelet count decreases significantly over time or prior to interventions such as renal transplantation.

Agents/circumstances to avoid: alcohol; obesity; diabetes mellitus; malnutrition; infection with human immunodeficiency virus (HIV); immunosuppression; hepatotoxic medicines; nonsteroidal anti-inflammatory drugs (NSAIDs) in those with varices because of the increased risk of bleeding; contact sports/activities in those with splenomegaly because of the increased risk of splenic injury.

Definition

Clinical Manifestations of Congenital Hepatic Fibrosis

Congenital hepatic fibrosis (CHF) is a histopathologic diagnosis that refers to a developmental disorder of the portobiliary system characterized by the following [Desmet 1998]:

  • Defective remodeling of the ductal plate (ductal plate malformation; DPM)
  • Abnormal branching of the intrahepatic portal veins
  • Progressive fibrosis of the portal tracts

Ductal plate malformation results in a range of abnormalities depending on the level of the biliary tree primarily involved:

  • CHF without macroscopically visible cystic dilatations of the intrahepatic biliary ducts
  • CHF associated with macroscopic liver cysts in continuity with the bile ducts, sometimes referred to as Caroli’s syndrome (CS).
    Note: Caroli’s disease (CD), which is much rarer than CS, refers to liver cysts contiguous with the biliary tree without CHF [Caroli 1973, Summerfield et al 1986]. Given that CS and CD may coexist in different members of the same family [Caroli 1973], these probably represent a continuum.

Characteristic clinical features of CHF include the following:

  • Large and abnormally shaped liver with the left lobe palpable below the xiphoid and the right lobe typically non-palpable
  • Increased echogenicity of the liver parenchyma with or without macrocysts on ultrasound examination, often in the presence of relatively well-preserved hepatocellular function
  • Portal hypertension (PH) resulting in splenomegaly, hypersplenism, and gastroesophageal varices

Note: Although all individuals with CHF have DPM detectable by liver biopsy at birth, abnormal liver echogenicity and splenomegaly may not be detectable during early childhood because portal fibrosis and PH are time-dependent pathologies that develop and progress with age.

Other clinical features of CHF can include recurrent cholangitis, especially when CS is part of CHF.

The severity and rate of progression of CHF and its complications vary widely even within the same family.

Portal hypertension (PH), strictly defined as an increase in the portal venous pressure leading to clinical sequelae, is the predominant manifestation of CHF [Kerr et al 1978, Summerfield et al 1986]. PH in CHF is caused by an increase in resistance to blood flow in the liver itself and is thought to be caused by congenital vascular abnormalities as well as progressive fibrosis.

In general, as hepatic fibrosis increases and PH worsens, the spleen increases in size, platelets and white blood cells decrease in number (hypersplenism), and porto-systemic vascular collaterals develop, including esophageal and gastric varices. As varices enlarge, the risk of bleeding increases [Kerr et al 1978, Summerfield et al 1986, Fonck et al 2001]. Variceal bleeding can occur at any age starting from infancy; however, significant PH takes time to develop and most commonly occurs in older children and adults.

Pulmonary hypertension (portopulmonary hypertension) and vascular shunts in the pulmonary parenchyma (hepatopulmonary syndrome) are complications of PH that can also be rarely seen in CHF.

Other complications of PH including ascites and encephalopathy are less common in CHF than in cirrhosis. Furthermore, individuals with CHF rarely manifest other systemic features associated with chronic liver disease, such as gynecomastia and enlarged parotid gland, with the exception of spider angiomata [Kerr et al 1978, Summerfield et al 1986, Fonck et al 2001].

Although the liver disease in individuals with CHF/CS is usually asymptomatic, the risk is increased for cholangitis and, less commonly, biliary stone formation and cholangiocarcinoma, which can develop at a relatively young age [Kerr et al 1978, Summerfield et al 1986, Fonck et al 2001].

No prospective studies of the natural history of CHF have been published.

Most reports on the natural history of CHF include small numbers of individuals with advanced CHF and an undetermined type of renal disease. Whether the manifestations or rate of progression of CHF differ according to the associated genetic disorder has not been determined (see Causes of Congenital Hepatic Fibrosis). Although the manifestations of non-cirrhotic PH and the complications of the bile duct abnormalities associated with autosomal recessive polycystic kidney disease (ARPKD)/CHF are well recognized, the variability in progression of CHF, even within the same family, makes prognostication difficult [Adeva et al 2006].

Factors that could exacerbate or accelerate fibrosis include excessive alcohol intake, steatohepatitis, hepatotoxic medicines, and viral hepatitis.

Establishing the Diagnosis of Congenital Hepatic Fibrosis

Ultrasound examination, the most informative diagnostic modality, often reveals:

  • Increased echogenicity of the liver
  • Cysts in the hepatic parenchyma [Premkumar et al 1988, Akhan et al 2007]
  • Enlarged spleen
  • Accompanying fibrocystic changes in the kidneys.
    Standard-resolution ultrasound examination is sufficient to evaluate the liver and spleen; in the authors’ experience high-resolution ultrasound using a 5-7 MHz probe is superior to standard-resolution ultrasound to diagnose mild renal cystic disease [NIH study, unpublished].

MRI including magnetic resonance cholangiopancreatography (MRCP) [Jung et al 1999, Brancatelli et al 2005] typically shows:

  • Cystic or fusiform dilatations and irregularities of the intrahepatic bile ducts
  • Abnormally large left lobe of the liver extending anteriorly under the xiphoid and to the left over the spleen
  • Fusiform dilation of the extrahepatic bile ducts
  • Elongation of the gall bladder
  • Enlarged spleen, which can be quantified by calculating volume
  • Accompanying fibrocystic changes in the kidneys

Because of the common association of renal disease with CHF and CS, many individuals with CHF have already undergone a renal evaluation.

The ultrasound and MRI findings described are highly suggestive of CHF, especially in the context of the following renal findings, which comprise the hepatorenal fibrocystic diseases (FCDs):

  • Polycystic kidney disease (PKD). Inherited cystic degeneration of both kidneys associated with progressive decline in renal function and hypertension in most affected individuals. Autosomal dominant PKD (ADPKD) and autosomal recessive PKD (ARPKD) are the most common types of PKD.
  • Glomerulocystic kidney disease and diffuse cystic dysplastic kidneys
  • The spectrum of tubulointerstitial disorders that includes the following:
    • Nephronophthisis (NPHP), characterized by normal-size or small kidneys with increased echogenicity on renal ultrasound examination. Renal cysts typically occur after onset of end-stage renal disease (ESRD) and localize primarily at the corticomedullary junction. Before the onset of ESRD individuals with NPHP tend to maintain blood pressure in the normal range.
    • Chronic tubulointerstitial disease, characterized histologically by renal tubular atrophy and tubulointerstitial fibrosis with relative sparing of glomerular and vascular structures
    • Urine-concentrating defect, the earliest and mildest manifestation of kidney involvement in FCDs. The urine-concentrating defect results from abnormal regulation of free water absorption in the collecting ducts; it manifests as polyuria and polydipsia.
  • Medullary sponge kidney. A radiologic term referring to microcystic dilatations of the renal collecting ducts observed on contrast imaging such as intravenous pyelography. A subset of individuals with medullary sponge kidney develops medullary nephrocalcinosis, radiologically demonstrable renal parenchymal calcification.
    Note: Nephrocalcinosis is different from nephrolithiasis (renal stones), in which calcification is within the lumen of the collecting system or ureter.

Liver biopsy reveals the following characteristic abnormalities associated with DPM:

  • Abundant, abnormally formed bile ducts in the portal tracts caused by an excess of embryonic bile duct structures remaining in their primitive ductal plate configuration [Desmet 1998] (often incorrectly described as “bile duct proliferation”)
  • Abnormal branching of the portal vein
  • Periportal fibrosis without inflammation
  • Portal-portal bridging fibrosis (i.e., not the portal tract to central vein bridging that is typical of cirrhosis)
  • Multiple bile duct hamartomas (von Meyenburg complexes) within dense fibrous stroma
  • Inspissated bile in the lumen of some ducts

Note: The hepatic parenchyma is normal without intrahepatic cholestasis or disruption of the hepatocellular plates.

Histopathologic findings on liver biopsy are the gold standard for diagnosis of CHF. However, liver biopsy is not required in most individuals, especially those with fibrocystic renal disease, because the diagnosis can be established on clinical findings alone [Fonck et al 2001].

Differential Diagnosis of Congenital Hepatic Fibrosis

Cirrhosis. CHF is often confused with cirrhosis because of the extensive fibrosis seen on biopsy and PH seen in CHF. A distinguishing feature of CHF and non-cirrhotic PH in general is preserved hepatic synthetic function [Sarin & Kumar 2006].

Diseases of the bile ducts that can lead to cirrhosis include primary biliary cirrhosis (PBC) and primary sclerosing cholangitis (PSC) [Kumagi et al 2008, Maggs & Chapman 2008]. However, both of these diseases are unusual in childhood, have significant elevation of the hepatic enzymes ALP and GGT (less common in CHF), and do not have the same appearance as CHF on imaging. Neither PBC nor PSC is associated with hepatic cystic disease.

  • In PBC the anti-mitochondrial antibody is positive in most individuals; this is not the case in CHF.
  • Like CHF, PSC is often associated with cholangitis. Furthermore, the bile duct strictures and dilations often seen in PSC may be mistaken for the dilated extrahepatic bile ducts of CHF and even the intrahepatic cysts of CHF.

Other causes of cirrhosis, such as viral hepatitis, alcohol-related liver disease, autoimmune hepatitis, alpha 1 antitrypsin deficiency, Wilson disease, and HFE-associated hereditary hemochromatosis, are distinguished based on history and laboratory testing.

Non-cirrhotic portal hypertension. Non-cirrhotic PH may be more difficult to distinguish from CHF than cirrhotic PH and relies on medical history, physical examination, laboratory testing, and imaging [Sarin & Kumar 2006]. The causes of non-cirrhotic PH are often divided into prehepatic (e.g., portal vein thrombosis), intrahepatic (e.g., schistosomiasis, nodular regenerative hyperplasia), and posthepatic (e.g., right-sided heart failure). Liver biopsy is often needed to identify intrahepatic causes of non-cirrhotic PH.

Hepatic cysts. Cysts in the liver, especially when few and small, may be a normal variant; the frequency of benign hepatic cysts increases with age.

The hepatic cysts seen in autosomal dominant polycystic liver disease, a distinct genetic disorder, may also lead to PH, but they are not typically associated with CHF and can be distinguished from cysts associated with CHF by the large number of cysts and the extent of involvement of the hepatic parenchyma [Drenth et al 2005].

Caroli’s disease (CD). CD is a congenital disorder of the liver characterized by cystic dilation of the intrahepatic bile ducts without CHF [Caroli 1973]. The diagnosis of CD relies on imaging studies. Given that CS, the association of CHF and macroscopic liver cysts in continuity with the bile ducts, and CD may coexist in different members of the same family [Caroli 1973], CS and CD probably represent a continuum.

Malignant liver disease. The multiple bile duct hamartomas of a von Meyenburg complex may be misdiagnosed as biliary cystadenoma and cystadenocarcinoma.

CHF without renal fibrocystic disease. CHF associated with chronic diarrhea and failure to thrive, hypoglycemia, and protein-losing enteropathy with coagulopathy suggests congenital disorder of glycosylation type Ib (CDG-Ib) (see Congenital Disorders of Glycosylation Overview). Analysis of serum transferrin glycoforms by isoelectric focusing and subsequent measurement of mannose phosphate isomerase enzyme activity in white blood cells is recommended for specific diagnosis.

Prevalence of the Congenital Hepatic Fibrosis

No prevalence data exist for CHF. However, based on the prevalence of various specific ciliopathies associated with CHF, the prevalence can be estimated at one in 10,000 to 20,000.

Causes of Congenital Hepatic Fibrosis

Congenital hepatic fibrosis/Caroli’s syndrome (CHF/CS) can rarely be an isolated finding; however, the gene(s) causing isolated CFF/CS is (are) unknown.

Most frequently CHF/CS is associated with ciliopathies (disorders of the primary cilia) that have associated renal disease: PKD, NPHP, and chronic tubulointerstitial disease, collectively referred to as the hepatorenal FCDs [Summerfield et al 1986].

The ciliopathies are caused by defects of proteins that reside on the cilia or its basal body structures [Fliegauf et al 2007]. The ciliopathies include defects of both the primary (immotile) cilia and the respiratory (motile) cilia. It is the primary cilia, not the motile cilia, that are involved in the hepatorenal FCDs. Primary cilia, one-per-cell antenna-like organelles present on most eukaryotic cells, sense extracellular chemical and mechanical stimuli (such as fluid flow) and host important developmental signaling pathways such as sonic hedgehog and Wnt. Intact primary cilia-based signaling is required to ensure normal development and maintenance of the bile ducts and renal tubules.

The hepatorenal FCDs are discussed below (see Table 1). Note: Kartagener syndrome, a ciliopathy of the motile cilia, characterized by recurrent sinopulmonary infections, right-left sidedness defects, and infertility, is not associated with hepatorenal FCD and therefore is not discussed here (see Primary Ciliary Dyskinesia).

Autosomal recessive polycystic kidney disease (ARPKD). Most individuals with ARPKD present in the neonatal period with enlarged echogenic kidneys. At initial presentation, fewer than half of infants have liver abnormalities, including hepatomegaly, dilated intrahepatic biliary ducts, and increased echogenicity. Approximately 30% of affected neonates die, primarily of respiratory insufficiency. More than 50% of affected children progress to ESRD, usually in the first decade of life. With neonatal respiratory support and renal replacement therapies, the ten-year survival of those who live beyond the first year of life has improved to 82%. Fifteen-year survival is estimated to be 67%-79%. A minority of individuals present as older children or adults, usually with hepatosplenomegaly or thrombocytopenia as the presenting feature. Advanced CHF can contribute to post-renal transplantation complications in ARPKD [Davis et al 2003]. ARPKD is not associated with abnormalities in other organ systems.

Meckel syndrome (MKS) is a perinatal lethal disorder characterized by renal cystic dysplasia, CHF, postaxial polydactyly, and occipital encephalocele or other central nervous system abnormalities [Khaddour et al 2007]. CHF has been identified in all individuals with MKS who have undergone liver biopsy. MKS is genetically heterogeneous and has significant overlap with Joubert syndrome and related disorders (JSRDs) and Bardet-Biedl syndrome (BBS) [Bergmann et al 2008, Tallila et al 2008].

Nephronophthisis (NPHP), part of the spectrum of the tubulointerstitial disorders, manifests initially as a urine-concentrating defect and anemia before progressing to ESRD in childhood in most individuals [Hildebrandt & Zhou 2007, Otto et al 2008, Salomon et al 2008]. In the infantile, juvenile, and adolescent forms of NPHP the median ages for ESRD are one, 13, and 19 years, respectively. Juvenile NPHP, the most common form, typically manifests between ages four and six years with polyuria, polydipsia, and anemia. Blood pressure is typically normal in juvenile NPHP before the onset of renal failure. Juvenile NPHP accounts for 5%-10% of ESRD in children. Approximately 10%-20% of individuals with NPHP have central nervous system and/or ocular involvement that includes structural cerebellar and midbrain abnormalities overlapping with JSRD and retinal degeneration (Senior-Løken syndrome).

Renal ultrasound examination shows normal size or small kidneys with increased echogenicity. In rare cases of infantile NPHP, kidney size may be enlarged. Renal cysts in NPHP are secondary, typically occurring after ESRD develops and localizing primarily at the corticomedullary junction.

Joubert syndrome and related disorders (JSRDs)

  • Joubert syndrome is characterized by a distinctive cerebellar and brain stem malformation (the molar tooth sign; MTS), hypotonia, developmental delays, and either episodic hyperpnea (or apnea), atypical eye movements, or both. Most children with Joubert syndrome develop truncal ataxia. Delayed acquisition of gross motor milestones is common. Cognitive abilities are variable, ranging from severe intellectual disability to normal. In general, the breathing abnormalities improve with age. The delineation of the phenotypic spectrum of Joubert syndrome remains unresolved, and both intra- and interfamilial variation are seen. Other features sometimes identified in Joubert syndrome include retinal dystrophy, renal disease, ocular colobomas, occipital encephalocele, CHF, polydactyly, oral hamartomas, and endocrine abnormalities. Some individuals with JSRD have clinically symptomatic CHF. Approximately 10% of individuals with Joubert syndrome have abnormal collections of cerebrospinal fluid in the posterior fossa that may resemble Dandy-Walker malformation. Joubert syndrome is genetically heterozygous with six genes identified to date [Cantagrel et al 2008].

The term JSRDs includes conditions that share the molar tooth sign and the clinical features of Joubert syndrome in addition to other manifestations that may represent a distinct syndrome.

JSRDs include:

  • COACH syndrome. A mnemonic for cerebellar vermis hypoplasia, oligophrenia, ataxia, coloboma, and hepatic fibrosis [Foell et al 2002].
  • Senior-Løken syndrome. Severe retinal degeneration with NPHP. Senior-Løken syndrome is characterized by NPH and severe retinal degeneration. Note: Sometimes the severe retinal degeneration of Senior-Løken syndrome is erroneously attributed to Leber congenital amaurosis, a disorder that affects the retina only and can be caused by mutations in at least 11 different genes.

Bardet-Biedl syndrome (BBS) is characterized by cone-rod dystrophy, truncal obesity, postaxial polydactyly, cognitive impairment, male hypogonadotrophic hypogonadism, complex female genitourinary malformations, and renal dysfunction. The visual prognosis for children with BBS is poor: night blindness is usually evident by age seven to eight years; the mean age at which affected individuals become legally blind is 15.5 years. Birth weight is usually normal, but significant weight gain begins within the first year and becomes a lifelong issue for most individuals. Most individuals have significant learning difficulties, but only a minority have severe impairment on IQ testing. Renal disease, a major cause of morbidity and mortality, is common; on ultrasound examination kidneys may have fetal lobulation and may be otherwise unremarkable or may be enlarged with diffusely increased echogenicity and loss of corticomedullary differentiation, similar to the findings of ARPKD. A characteristic finding in BBS, detected by intravenous contrast imaging methods such as intravenous pyelography, is renal calyceal clubbing, blunting, and distortion in the absence of distal obstruction.

Cranioectodermal dysplasia (CED) (Sensenbrenner syndrome) is characterized by abnormal bone growth (dolichocephaly, rhizomelic shortening of extremities, narrow rib cage, and decreased bone density), dental and nail dysplasia, and progressive tubulointerstitial nephritis resulting in ESRD in early childhood [Zaffanello et al 2006]. Retinal dystrophy has been reported in a few patients.

Ellis-van Creveld syndrome (EVC) is characterized by abnormal bone growth (disproportionate short stature with short limbs and ribs), congenital heart disease (most commonly an atrioventricular septal defect), postaxial polydactyly, dystrophic nails and teeth, and retinal degeneration.

Jeune asphyxiating thoracic dystrophy (JATD) is characterized by abnormal bone growth resulting in short stature, small thoracic cage and hypoplastic lungs, chronic tubulointerstitial nephritis, and CHF [Hudgins et al 1992]. Death in infancy is common, usually as a consequence of respiratory insufficiency. Most individuals with JATD who survive infancy develop retinal dystrophy and renal failure as a result of chronic tubulointerstitial nephritis. CHF is a consistent finding in autopsy and liver biopsy specimens. Individuals with JATD who are evaluated for liver disease have CHF associated with significantly elevated levels of liver enzymes ALT, AST, and GGT.

Renal-hepatic-pancreatic dysplasia (RHPD) is characterized by cystic dysplastic kidneys, DPM of the liver, and fibrocystic dysplasia of the pancreas [Sergi et al 2000, White et al 2000, Zaffanello et al 2006]. Partial or total situs inversus may be seen; however, the presence of situs anomalies is expected in only a subset of affected individuals because the defective nodal ciliary function that results in random determination of sidedness is associated with normal sidedness 50% of the time. RHPD is usually fatal in the perinatal period. Clinical variability is considerable. NPHP3 is the first gene known to be associated with renal-hepatic-pancreatic dysplasia [Bergmann et al 2008].

Oral-facial-digital syndrome type 1 (OFD1) is characterized by the following abnormalities: oral (lobed tongue, hamartomas or lipomas of the tongue, cleft of the hard or soft palate, accessory gingival frenulae, hypodontia and other dental abnormalities); facial (ocular hypertelorism or telecanthus, hypoplasia of the alae nasi, median cleft or pseudocleft upper lip, micrognathia); digital (brachydactyly, syndactyly of varying degrees, and clinodactyly of the fifth finger; duplicated hallux [great toe]; preaxial or postaxial polydactyly of the hands); brain (intracerebral cysts, corpus callosum agenesis, cerebellar agenesis with or without Dandy-Walker malformation); and kidney (PKD). As many as 50% of individuals with OFD1 have some degree of intellectual disability, usually mild. Inheritance is X-linked.

Autosomal dominant polycystic kidney disease (ADPKD) is generally a late-onset multisystem disorder characterized by bilateral renal cysts; cysts in other organs including the liver, seminal vesicles, pancreas, and arachnoid membrane; vascular abnormalities including intracranial aneurysms, dilatation of the aortic root, and dissection of the thoracic aorta; mitral valve prolapse; and abdominal wall hernias. Some individuals with ADPKD present in childhood, even prenatally, with diffusely cystic kidneys that can be difficult to differentiate from those of ARPKD.

Substantial variability in severity of renal disease and other extrarenal manifestations occurs even within the same family. Approximately 50% of individuals with ADPKD have ESRD by age 60 years. The prevalence of liver cysts, the most common extrarenal manifestation of ADPKD, increases with age and may have been underestimated by ultrasound and CT studies. In ADPKD hepatic cysts are not usually associated with CHF or PH; however, some members of approximately ten families with ADPKD published in the literature have well-documented CHF and PH [Tazelaar et al 1984, Lee & Paes 1985, Cobben et al 1990, Matsuda et al 1990, Lipschitz et al 1993, Chait et al 1994, Kaczorowski et al 2001]. Two of the three such families evaluated at the NIH were found on sequence analysis to have PKD1 mutations known to be associated with ADPKD.

Table 1. Summary of Molecular Genetics of the Hepatorenal Fibrocystic Diseases

Mode of InheritanceDisease NameLocus NameGene Symbol
Autosomal RecessiveARPKDPKHD1PKHD1
NephronophthisisNPHP1 1NPHP1
NPHP2INVS
NPHP3NPHP3
NPHP4NPHP4
NPHP5
(SLSN5)
IQCB1
NPHP6 2
(SLSN6)
CEP290
NPHP7GLIS2
NPHP8 3RPGRIP1L
NPHP9NEK8
Joubert syndrome and related disordersJBTS1
JBTS2
JBTS3AHI1
JBTS4 1NPHP1
JBTS5 2CEP290
JBTS6 4TMEM67
JBTS7 3RPGRIP1L
JBTS8 ARL13B
Bardet-Biedl syndromeBBS1BBS1
BBS2BBS2
BBS3ARL6
BBS4BBS4
BBS5BBS5
BBS6MKKS
BBS7BBS7
BBS8TTC8
BBS9BBS9
BBS10BBS10
BBS11TRIM32
BBS12BBS12
BBS13 5MKS1
BBS14 2CEP290
Meckel syndromeMKS1 5MKS1
MKS2-
MKS3 4TMEM67
MKS4 2CEP290
MKS5 3RPGRIP1L
MKS6CC2D2A
Cranioectodermal dysplasiaUnknownUnknown
Ellis-van Creveld syndromeEVC 6EVC
EVC2
Jeune asphyxiating thoracic dystrophyJATDIFT80
Renal-hepatic-pancreatic dysplasiaNPHP3
X-LinkedOFD1OFD1
Autosomal DominantADPKDPKD1PKD1
PKD2PKD2

ARPKD= Autosomal recessive polycystic kidney disease

ADPKD= Autosomal dominant polycystic kidney disease

1. Locus names for NPHP1 include: NPHP1, JBTS4

2. Locus names for CEP290 include: NPHP6 (SLSN6), JBTS5, BBS14, MKS4. CEP290 mutations result in phenotypes ranging from Leber congenital amaurosis (in which only the retina is involved) to typical perinatal lethal MKS [Baala et al 2007, Helou et al 2007].

3. Locus names for RPGRIP1L include: NPHP8, JBTS7, MKS5

4. Locus names for TMEM67 include: JBTS6, MKS3

5. Locus names for MKS1 include: BBS13, MKS1

6. EVC and EVC2 lie in a head-to-head configuration at the same locus.

Phenotypic features shared by the hepatorenal fibrocystic diseases. The most common phenotypic features of the hepatorenal FCDs are described below. Although each of the hepatorenal FCDs has distinct features, the clinical findings and the associated genes overlap in several (see Table 1):

  • CHF is a constant finding in ARPKD and MKS; it occurs with variable frequencies in JSRDs, BBS, OFD1, EVC, JATD, and RHPD.
  • Developmental abnormalities of the mid/hindbrain that range from Dandy-Walker variant/mega cisterna magna to occipital encephalocele (as in JSRDs and MKS) are the second most common manifestation in the hepatorenal FCDs [Badano et al 2006].
  • Retinal degeneration, resulting from involvement of the connecting cilia of the photoreceptor cells that are specialized primary cilia of the retina, is a common manifestation of the hepatorenal fibrocystic diseases [Adams et al 2007]. Retinal degeneration is observed consistently in BBS, Senior-Løken syndrome, and a subset of individuals with JSRDs.
  • Polydactyly, seen with variable frequencies in many ciliopathies including MKS, BBS, OFD1, and JSRDs, is mostly postaxial and can involve upper and lower extremities.
  • Right-left sidedness defects (lateralization defects, situs inversus) are seen in some disorders of the primary cilia (e.g., BBS and RHPD). The situs abnormalities may result in complete or partial reversal of internal organs including lungs, heart, liver, gastrointestinal tract, and spleen. In RHPD the lateralization defects include the so-called polysplenia/asplenia syndromes. The presence of lateralization defects in only some ciliopathies is probably due to the fact that only a subset of the primary cilia proteins are critical for the function of the nodal cilia of the embryo, which determine body asymmetry.

Currently, the hepatorenal FCDs are classified by phenotype; however, because of tremendous phenotypic and genetic overlap (see Table 1) between the hepatorenal FCDs, it is likely that in future the gene-based classification will be quite different from the current phenotype-based classification.

Furthermore, the large proportion of individuals with a ciliopathy (such as NPHP and JSRDs) with only one identified mutation and the extreme variability of the phenotype associated with mutations in some genes (e.g., CEP290, associated with NPHP6, JBTS5, MKS4, and Leber congenital amaurosis) suggest that some individuals with a hepatorenal fibrocystic disease may have mutations in more than one gene encoding a protein found in cilia or basal bodies.

Genotype-phenotype correlations

ARPKD. Most infants with severe perinatal ARPKD and CHF have two protein truncating mutations in PKHD1. Most individuals who survive the neonatal period have at least one milder (missense) mutation [Bergmann et al 2003]. However, perinatal disease severity in ARPKD/CHF is largely determined by the extent of the kidney disease. No genotype-phenotype correlation data on PKHD1-related CHF exist at this time.

Meckel syndrome (MKS). MKS1 mutations are detected in:

MKS3, originally called TMEM6, displays frameshift, missense, and splice-site mutations in several instances of perinatal lethal MKS with occipital encephalocele, cystic dysplastic kidneys, and postaxial polydactyly. Mild variable CNS phenotypes are associated with MKS3 mutations [Khaddour et al 2007]. Three children with Joubert syndrome displayed missense, splice-site, and frameshift mutations in MKS3 and two fetuses with Meckel-like phenotypes had splice-site mutations.

MKS with postaxial polydactyly is more likely to be associated with MKS1 mutations than MKS3 mutations [Khaddour et al 2007].

Compared with mutations in MKS1, mutations in MKS3 appear less likely to be associated with polydactyly and encephalocele and more likely to be associated with milder CNS phenotypes, with considerable variability.

Evaluation Strategy

Once the diagnosis of congenital hepatic fibrosis (CHF) has been established in a proband, the following approach can be used to determine the specific cause of the CHF to aid in discussions of prognosis and genetic counseling.

Family history. A detailed three-generation family history focusing on hepatorenal fibrocystic disease, CHF/CS, liver or kidney disease of unknown etiology, and the associated findings of the multisystem disorders discussed in this GeneReview can be used to help determine the inheritance pattern in an individual with CHF.

  • Attention to a history of consanguinity and medical problems in sibs and evaluation of any unusual findings in sibs may clarify if one of the autosomal recessive disorders discussed in Table 1 is present.
  • If an autosomal recessive syndrome is not identified in the proband and/or the findings and/or family history suggest autosomal dominant inheritance, then ultrasound examination of parents and sibs to evaluate for the presence of asymptomatic kidney and/or liver disease characteristic of ADPKD is useful even in the absence of a positive family history.

Physical examination. The presence of other findings including the following may suggest a specific diagnosis: PKD, NPHP, tubulointerstitial nephritis, medullary nephrocalcinosis, medullary sponge kidney, or urine concentration defect in normal appearing kidneys; retinopathy; ocular coloboma; oculomotor apraxia; speech apraxia; mid/hindbrain abnormalities ranging from nonspecific posterior fossa abnormalities such as enlarged basilar cisterns or Dandy-Walker variant to classic MTS; developmental delay; oral anomalies; polydactyly; obesity; situs inversus; and short stature or other abnormalities suggesting a skeletal dysplasia.

Testing

Other evaluations, including kidney function tests, echocardiogram, skeletal survey, complete eye examination, and brain MRI, may be useful to establish the specific hepatorenal fibrocystic disease associated with CHF based on the abnormalities identified on family history and physical examination.

Molecular genetic testing. Although the clinical diagnosis of a specific hepatorenal FCD guides molecular genetic testing, some unique aspects of hepatorenal FCD in general may complicate the diagnostic approach. Hepatorenal FCDs are genetically heterogeneous and share significant overlap in phenotype and associated genes: NPHP is associated with mutations in eight genes, JSRDs seven genes, BBS 14 genes, and MKS six genes (see Table 1).

In typical ARPKD/CHF, the diagnosis is often made on clinical findings; however, molecular genetic testing of PKHD1 is being increasingly performed, especially in individuals with atypical findings.

In individuals with MKS who are of European origin, testing for the 29-bp IVS15-7_35 deletion in MKS1 should be prioritized [Auber et al 2007]. Testing of MKS1 and MKS3 may be prioritized based on phenotype (see Causes, Meckel syndrome).

Genetic Counseling

Genetic counseling is the process of providing individuals and families with information on the nature, inheritance, and implications of genetic disorders to help them make informed medical and personal decisions. The following section deals with genetic risk assessment and the use of family history and genetic testing to clarify genetic status for family members. This section is not meant to address all personal, cultural, or ethical issues that individuals may face or to substitute for consultation with a genetics professional. —ED.

Mode of Inheritance

The syndromes associated with congenital hepatic fibrosis (CHF) can be inherited as a multisystem disorder in an autosomal dominant, autosomal recessive, or X-linked recessive manner. Genetic counseling depends on accurate determination of the specific genetic diagnosis.

CHF is rarely an isolated finding; the gene(s) resulting in isolated CHF are unknown.

Empiric Risks to Family Members – Isolated CHF

This section is written from the perspective that clinical testing for this disorder is available and results can be used for clinical purposes. However, it is the responsibility of the clinician to ascertain whether such testing is available for a specific patient .—ED.

Parents, sibs, offspring of a proband. No data on the empiric risk to parents, sibs, or offspring of an individual with isolated CHF (i.e., not a part of a syndrome) are available.

Related Genetic Counseling Issues

Family planning

  • The optimal time for determination of genetic risk is before pregnancy.
  • It is appropriate to offer genetic counseling (including discussion of potential risks to offspring and reproductive options) to young adults who are affected.

DNA banking is the storage of DNA (typically extracted from white blood cells) for possible future use. Because it is likely that testing methodology and our understanding of genes, mutations, and diseases will improve in the future, consideration should be given to banking DNA of affected individuals.

Prenatal Testing

Molecular genetic testing. CHF is typically one of several findings in an individual with a specific syndrome. If the disease-causing mutation(s) have been identified in an affected family member, prenatal diagnosis by molecular genetic testing is possible.

Ultrasound examination

  • The echogenicity of the fetal liver in individuals with the hepatorenal FCDs discussed in this GeneReview is not identified on prenatal ultrasound examination.
  • In most cases of hepatorenal FCDs, prenatal ultrasound examination is more likely to show findings associated with renal disease than with liver disease (including hyperechoic kidneys that are either enlarged or normal size and oligohydramnios) or to show findings of associated malformations such as polydactyly, posterior encephalocele, cerebellar hypoplasia, or other central nervous system anomalies, oral clefts, or abnormalities of bone growth.
  • In rare instances of prenatal onset of CS, fetal liver cysts can be visualized on ultrasound examination.

Resources

GeneReviews staff has selected the following disease-specific and/or umbrella support organizations and/or registries for the benefit of individuals with this disorder and their families. GeneReviews is not responsible for the information provided by other organizations. For information on selection criteria, click here.

  • ARPKD/CHF Alliance
    PO Box 70
    Kirkwood PA 17536
    Phone: 800-708-8892 (toll-free); 717-529-5555
    Fax: 800-807-9110 (toll-free)
    Email: info@arpkdchf.org
  • American Liver Foundation
    75 Maiden Lane
    Suite 603
    New York NY 10038
    Phone: 800-465-4837 (Toll-free HelpLine); 212-668-1000
    Fax: 212-483-8179
    Email: info@liverfoundation.org
  • Children's Liver Disease Foundation (CLDF)
    36 Great Charles Street
    Birmingham B3 3JY
    United Kingdom
    Phone: +44 (0) 121 212 3839
    Fax: +44 (0) 121 212 4300
    Email: info@childliverdisease.org

Management

Evaluations Following Initial Diagnosis

To establish the extent of disease in an individual diagnosed with congenital hepatic fibrosis (CHF), the following evaluations are recommended:

  • Complete blood count, hepatic panel, and coagulation profile and ultrasound examination to identify mild, moderate, or severe PH, hypersplenism, and biliary tree abnormalities [Lonergan et al 2000].
  • Esophago-gastro-duodenoscopy (EGD) to screen for varices, particularly when the platelet count has decreased significantly over time or prior to interventions such as renal transplantation [Garcia-Tsao et al 2007, Bosch et al 2008]. Although not universally accepted in children, screening for varices allows for prognostication, planning, and primary prevention of variceal bleeding.
  • Screening for hepatopulmonary syndrome is achieved by measuring upright oxygen saturation and screening for portopulmonary hypertension is performed with echocardiogram to estimate pulmonary artery pressure [Whitworth & Sokol 2005].

Treatment of Manifestations

There is no known treatment for the underlying defect in CHF: no therapies can repair the primary ductal plate malformation or reverse the fibrosis or biliary tree abnormalities. Therapies based on extrapolations from other forms of liver disease, anecdotal reports, and deductive reasoning are used to manage the complications of the underlying defect [Shneider & Magid 2005].

The most important manifestations of CHF are variceal bleeding, hypersplenism, cholangitis and, to a lesser extent, biliary stones, cholangiocarcinoma, and hepatocellular carcinoma.

Variceal bleeding. The management of varices has been reviewed [Shneider & Magid 2005, Garcia-Tsao et al 2007, Bosch et al 2008]. Care should be provided by those experienced in the management of PH.

Primary prevention (prior to any variceal bleeding) entails screening for varices and treating medium or large varices with nonselective beta blockers with the dose titrated to pulse and blood pressure. If beta blockers are not tolerated, variceal banding should be considered.

Standard procedures for management of variceal bleeding include obtaining adequate initial intravenous access, resuscitation, transfusion without over transfusion, octreotide, antibiotic prophylaxis, proton pump inhibition, and endoscopy when stabilized.

Secondary prevention of variceal bleeding (once bleeding has already occurred) consists of banding of esophageal varices, histacryl injection of gastric varices, and continued use of nonselective beta blockers. Because banding devices do not fit on the smallest endoscopes, small children with variceal bleeding often undergo sclerotherapy instead.

Individuals who have had repeated variceal bleeding, especially if gastric varices are present, should be considered for surgical portosystemic shunting rather than repeated variceal ligation [Shneider & Magid 2005, Garcia-Tsao et al 2007, Bosch et al 2008]. Such intervention is best performed in a center experienced with this procedure.

Although controversial, consideration of a surgical shunt in an individual with CHF who has never had variceal bleeding may be reasonable if PH is likely to progress and liver transplantation is unlikely given the intact hepatic synthetic function. A surgical shunt would also be a strong consideration in an individual with large varices that have never bled if appropriate expert care is not available for emergent management of variceal bleeding.

Transjugular intrahepatic portosystemic shunts (TIPS) are widely available. However, it is the authors’ opinion that use of TIPS is not indicated outside of an emergency; because of their intrinsic occlusion rate, TIPS could require repeated procedures to maintain adequate patency. Furthermore, the intravenous contrast often utilized to assess and perform TIPS revisions is potentially nephrotoxic – a serious consideration given the typical association of CHF with ARPKD.

Hypersplenism. Hypersplenism usually does not result in clinically significant sequelae. Individuals with significant splenomegaly are fitted with spleen guards to wear when playing sports or performing activities that could result in splenic injury.

Splenectomy is contraindicated because it does not treat the underlying PH and often exacerbates it.

Abnormalities of the biliary tree. Cholangitis should be considered and investigated in individuals known to have biliary dilatation who develop unexplained fever or right upper-quadrant pain with or without jaundice [Shneider & Magid 2005].

Cholangitis is best treated with rapid institution of appropriate antibiotics.

Segmental resection of the liver is an option for individuals with segmental bile duct abnormalities who have had repeated episodes of cholangitis [Ulrich et al 2008] even though cysts may form in other areas of the liver after the resection.

Recurrent cholangitis with or without more widespread bile duct abnormalities is best treated with liver transplantation. If cysts in the extrahepatic bile duct are complicated by recurrent infection and/or the presence of stones, excision of the common bile duct with a Roux-en-Y hepatojejunal anastomosis has been recommended.

Biliary stones. The treatment of biliary stones depends on their location, number, and size. Care is best provided in a tertiary care facility with expertise in managing biliary stones.

Cholangiocarcinoma and hepatocellular carcinoma. These should be managed by a multidisciplinary team.

Patient education. Patients are taught the manifestations of variceal bleeding (hematemesis, melena, and hematochezia) and cholangitis (fever, abdominal pain, and jaundice) and instructed to seek appropriate care when such manifestations occur.

Prevention of Secondary Complications

The Centers for Disease Control (CDC) recommends immunization for hepatitis A and B in persons with chronic liver disease.

Although evidence is lacking, antibiotic prophylaxis for recurrent cholangitis is sometimes used in individuals who have had cholangitis [Shneider & Magid 2005].

Surveillance

General health should be closely followed. Decreased growth rate should be investigated as it is less likely to be the result of PH than of other associated problems, such as reduced renal function.

Extrapolating from studies in persons with cirrhosis, individuals with CHF should be screened for esophageal varices particularly when the platelet count decreases significantly over time or prior to interventions such as renal transplantation [Garcia-Tsao et al 2007, Bosch et al 2008].

  • Small varices warrant a repeat esophago-gastro-duodenoscopy (EGD) in a year.
  • If no varices are identified when EGD is performed because of a decline in platelet count, EGD should be repeated every two to three years.

Screening for hepatopulmonary syndrome is achieved by measuring upright oxygen saturation; screening for portopulmonary hypertension is performed with echocardiogram to estimate pulmonary artery pressure [Whitworth & Sokol 2005] in the presence of sustained platelet decrease and/or prior to an intervention.

Imaging allows:

  • Assessment of spleen size to indirectly follow PH
  • Visualization of bile duct abnormalities (e.g. cysts in the liver) that could identify individuals at greater risk for cholangitis, bile duct stones, and cholangiocarcinoma

The appropriate frequency of surveillance imaging is not well defined and depends on disease severity. For individuals with mild disease, ultrasound examination every two years would be adequate; for those with more severe disease, an annual ultrasound examination could enable adequate monitoring of disease progression.

Note: No data on surveillance for cholangiocarcinoma or hepatocellular carcinoma in this setting are available.

Agents/Circumstances to Avoid

The following agents/illnesses known to accelerate hepatic fibrosis could have the same effect in CHF and should be avoided or aggressively managed:

  • Alcohol
  • Obesity
  • Diabetes mellitus
  • Malnutrition
  • Infection with human immunodeficiency virus (HIV)
  • Immunosuppression (e.g., after renal transplantation)

Hepatotoxic medicines should be avoided.

Nonsteroidal anti-inflammatory drugs (NSAIDs) should be avoided in those with varices because of the risk of gastrointestinal bleeding and poor clotting as a result of impaired platelet function.

Behavior that could increase the risk of viral hepatitis should be avoided.

Contact sports, or activities that are likely to result in splenic injury, are to be avoided once the spleen is significantly enlarged.

Evaluation of Relatives at Risk

See Genetic Counseling for issues related to testing of at-risk relatives for genetic counseling purposes.

Therapies Under Investigation

Although there are theoretical reasons why choleretics such as ursodeoxycholate may impede the development of abnormalities of the bile ducts, or even fibrosis, this has not been proven [Shneider & Magid 2005].

Search ClinicalTrials.gov for access to information on clinical studies for a wide range of diseases and conditions.

References

Medical Genetic Searches: A specialized PubMed search designed for clinicians that is located on the PubMed Clinical Queries page Image PubMed.jpg

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Suggested Reading

  1. Fliegauf M, Benzing T, Omran H. When cilia go bad: cilia defects and ciliopathies. Nat Rev Mol Cell Biol. 2007;8:880–93. [PubMed: 17955020]
  2. Kerkar N, Norton K, Suchy FJ. The hepatic fibrocystic diseases. Clin Liver Dis. 2006;10:55–71. [PubMed: 16376794]
  3. Tahvanainen E, Tahvanainen P, Kaariainen H, Hockerstedt K. Polycystic liver and kidney diseases. Ann Med. 2005;37:546–55. [PubMed: 16338757]

Chapter Notes

Acknowledgments

The authors thank the ARPKD/CHF Alliance, The Joubert Syndrome & Related Cerebellar Disorders Foundation, and all patients and their families who generously participated in the ongoing NIH research protocol on ARPKD/CHF and other ciliopathies (ClinicalTrials.gov, NCT00068224).

Revision History

  • 9 December 2008 (me) Review posted live
  • 25 July 2008 (mga) Original submission

Note: Pursuant to 17 USC Section 105 of the United States Copyright Act, the GeneReview ‘Congenital Hepatic Fibrosis Overview’ is in the public domain in the United States of America.

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