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1.

Holoprosencephaly sequence

Holoprosencephaly (HPE) is a structural anomaly of the brain in which there is failed or incomplete separation of the forebrain early in gestation. Classic HPE encompasses a continuum of brain malformations including (in order of decreasing severity): alobar, semilobar, lobar, and middle interhemispheric variant (MIHV) type HPE; a septopreoptic type has also been described. Other CNS abnormalities not specific to HPE may also occur. HPE is accompanied by a spectrum of characteristic craniofacial anomalies in approximately 80% of individuals with HPE. Developmental delay is present in virtually all individuals with the HPE spectrum of CNS anomalies. Seizures and pituitary dysfunction are common. Most affected fetuses do not survive; severely affected children typically do not survive beyond early infancy, while a significant proportion of more mildly affected children survive past 12 months. Mildly manifesting individuals without appreciable brain anomalies on conventional neuroimaging may be described as having “microform” HPE. [from GTR]

MedGen UID:
38214
Concept ID:
C0079541
Congenital Abnormality
2.

Holoprosencephaly

Holoprosencephaly is a structural anomaly of the brain in which the developing forebrain fails to divide into two separate hemispheres and ventricles. [from HPO]

MedGen UID:
504813
Concept ID:
CN001246
Finding
3.

Holoprosencephaly 4

Holoprosencephaly (HPE) is a structural anomaly of the brain in which there is failed or incomplete separation of the forebrain early in gestation. Classic HPE encompasses a continuum of brain malformations including (in order of decreasing severity): alobar, semilobar, lobar, and middle interhemispheric variant (MIHV) type HPE; a septopreoptic type has also been described. Other CNS abnormalities not specific to HPE may also occur. HPE is accompanied by a spectrum of characteristic craniofacial anomalies in approximately 80% of individuals with HPE. Developmental delay is present in virtually all individuals with the HPE spectrum of CNS anomalies. Seizures and pituitary dysfunction are common. Most affected fetuses do not survive; severely affected children typically do not survive beyond early infancy, while a significant proportion of more mildly affected children survive past 12 months. Mildly manifesting individuals without appreciable brain anomalies on conventional neuroimaging may be described as having “microform” HPE. [from GTR]

MedGen UID:
374488
Concept ID:
C1840528
Disease or Syndrome
4.

Holoprosencephaly 5

Holoprosencephaly (HPE) is a structural anomaly of the brain in which there is failed or incomplete separation of the forebrain early in gestation. Classic HPE encompasses a continuum of brain malformations including (in order of decreasing severity): alobar, semilobar, lobar, and middle interhemispheric variant (MIHV) type HPE; a septopreoptic type has also been described. Other CNS abnormalities not specific to HPE may also occur. HPE is accompanied by a spectrum of characteristic craniofacial anomalies in approximately 80% of individuals with HPE. Developmental delay is present in virtually all individuals with the HPE spectrum of CNS anomalies. Seizures and pituitary dysfunction are common. Most affected fetuses do not survive; severely affected children typically do not survive beyond early infancy, while a significant proportion of more mildly affected children survive past 12 months. Mildly manifesting individuals without appreciable brain anomalies on conventional neuroimaging may be described as having “microform” HPE. [from GTR]

MedGen UID:
355304
Concept ID:
C1864827
Disease or Syndrome
5.

Holoprosencephaly 3

Holoprosencephaly (HPE) is a structural anomaly of the brain in which there is failed or incomplete separation of the forebrain early in gestation. Classic HPE encompasses a continuum of brain malformations including (in order of decreasing severity): alobar, semilobar, lobar, and middle interhemispheric variant (MIHV) type HPE; a septopreoptic type has also been described. Other CNS abnormalities not specific to HPE may also occur. HPE is accompanied by a spectrum of characteristic craniofacial anomalies in approximately 80% of individuals with HPE. Developmental delay is present in virtually all individuals with the HPE spectrum of CNS anomalies. Seizures and pituitary dysfunction are common. Most affected fetuses do not survive; severely affected children typically do not survive beyond early infancy, while a significant proportion of more mildly affected children survive past 12 months. Mildly manifesting individuals without appreciable brain anomalies on conventional neuroimaging may be described as having “microform” HPE. [from GTR]

MedGen UID:
327125
Concept ID:
C1840529
Disease or Syndrome
6.

Holoprosencephaly 2

Holoprosencephaly (HPE) is a structural anomaly of the brain in which there is failed or incomplete separation of the forebrain early in gestation. Classic HPE encompasses a continuum of brain malformations including (in order of decreasing severity): alobar, semilobar, lobar, and middle interhemispheric variant (MIHV) type HPE; a septopreoptic type has also been described. Other CNS abnormalities not specific to HPE may also occur. HPE is accompanied by a spectrum of characteristic craniofacial anomalies in approximately 80% of individuals with HPE. Developmental delay is present in virtually all individuals with the HPE spectrum of CNS anomalies. Seizures and pituitary dysfunction are common. Most affected fetuses do not survive; severely affected children typically do not survive beyond early infancy, while a significant proportion of more mildly affected children survive past 12 months. Mildly manifesting individuals without appreciable brain anomalies on conventional neuroimaging may be described as having “microform” HPE. [from GTR]

MedGen UID:
322517
Concept ID:
C1834877
Disease or Syndrome
7.

Thyroid hormone plasma membrane transport defect

MedGen UID:
396060
Concept ID:
C1861101
Disease or Syndrome
8.

Short arm

MedGen UID:
98429
Concept ID:
C0426857
Finding
9.

Heterogeneous

The presence of apparently similar characters for which the genetic evidence indicates that different genes or different genetic mechanisms are involved in different pedigrees. In clinical settings genetic heterogeneity refers to the presence of a variety of genetic defects which cause the same disease, often due to mutations at different loci on the same gene, a finding common to many human diseases including ALZHEIMER DISEASE; CYSTIC FIBROSIS; LIPOPROTEIN LIPASE DEFICIENCY, FAMILIAL; and POLYCYSTIC KIDNEY DISEASES. (Rieger, et al., Glossary of Genetics: Classical and Molecular, 5th ed; Segen, Dictionary of Modern Medicine, 1992) [from MeSH]

MedGen UID:
67020
Concept ID:
C0242960
Organism Attribute
10.

Abnormality of the nervous system

An abnormality of the nervous system that is present at birth or detected in the neonatal period. [from NCI]

MedGen UID:
105425
Concept ID:
C0497552
Congenital Abnormality
11.

Corpus callosum agenesis

The corpus callosum is the largest fiber tract in the central nervous system and the major interhemispheric fiber bundle in the brain. Formation of the corpus callosum begins as early as 6 weeks' gestation, with the first fibers crossing the midline at 11 to 12 weeks' gestation, and completion of the basic shape by age 18 to 20 weeks (Schell-Apacik et al., 2008). Agenesis of the corpus callosum (ACC) is one of the most frequent malformations in brain with a reported incidence ranging between 0.5 and 70 in 10,000 births. ACC is a clinically and genetically heterogeneous condition, which can be observed either as an isolated condition or as a manifestation in the context of a congenital syndrome (see MOLECULAR GENETICS and Dobyns, 1996). Also see mirror movements-1 and/or agenesis of the corpus callosum (MRMV1; 157600). Schell-Apacik et al. (2008) noted that there is confusion in the literature regarding radiologic terminology concerning partial absence of the corpus callosum, where various designations have been used, including hypogenesis, hypoplasia, partial agenesis, or dysgenesis. [from GTR]

MedGen UID:
104498
Concept ID:
C0175754
Congenital Abnormality; Finding
12.

Sequence Deletion

Deletion of sequences of nucleic acids from the genetic material of an individual. [from MeSH]

MedGen UID:
102460
Concept ID:
C0162773
Cell or Molecular Dysfunction
13.

Craniofacial Abnormalities

Congenital structural deformities, malformations, or other abnormalities of the cranium and facial bones. [from MeSH]

MedGen UID:
91281
Concept ID:
C0376634
Congenital Abnormality
14.

Cranioschisis

A congenital abnormality characterized by the failure of the bones of the skull to close. [from NCI]

MedGen UID:
78563
Concept ID:
C0265541
Congenital Abnormality
15.

Congenital anomaly of musculoskeletal system

An abnormality of the musculoskeletal system that is present at birth or detected in the neonatal period. [from NCI]

MedGen UID:
57466
Concept ID:
C0151491
Congenital Abnormality
16.

Arrhinencephaly

MedGen UID:
36258
Concept ID:
C0078982
Congenital Abnormality
17.

Multiple congenital anomalies

Congenital abnormalities that affect more than one organ or body structure. [from MeSH]

MedGen UID:
7806
Concept ID:
C0000772
Congenital Abnormality
18.

Disorder of musculoskeletal system

A category of diseases that involve muscles and bones. [from NCI]

MedGen UID:
6471
Concept ID:
C0026857
Disease or Syndrome
19.

Congenital chromosomal disease

A disorder that results from a chromosomal abnormality. [from NCI]

MedGen UID:
3441
Concept ID:
C0008626
Congenital Abnormality; Disease or Syndrome
20.

Developmental abnormality

Any abnormality, anatomical or biochemical, evident at birth or during the neonatal period. [from NCI]

MedGen UID:
1254
Concept ID:
C0000768
Congenital Abnormality
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