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Items: 11

1.

Leukoencephalopathy

This term describes abnormality of the white matter of the cerebrum resulting from damage to the myelin sheaths of nerve cells. [from HPO]

MedGen UID:
505209
Concept ID:
CN002135
Finding
2.

Thyroid hormone plasma membrane transport defect

MedGen UID:
396060
Concept ID:
C1861101
Disease or Syndrome
3.

Megalencephalic leukoencephalopathy with subcortical cysts 1

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to the 98th percentile, usually several centimeters above it. Almost all individuals have epilepsy from an early age. Initial mental and motor development is normal in most cases. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Mental deterioration is late and mild. Severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their forties. An atypical improving phenotype has a similar initial presentation without mental or motor regression, followed by an improving clinical course: motor and cognitive functions improve or normalize; macrocephaly usually persists, but some children become normocephalic; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable with or without autism. [from GeneReviews]

MedGen UID:
347006
Concept ID:
C1858854
Congenital Abnormality; Disease or Syndrome
4.

Leukoencephalopathy

Any of various diseases affecting the white matter of the central nervous system. [from MeSH]

MedGen UID:
78722
Concept ID:
C0270612
Disease or Syndrome
5.

Atrophy

Decrease in the size of a cell, tissue, organ, or multiple organs, associated with a variety of pathological conditions such as abnormal cellular changes, ischemia, malnutrition, or hormonal changes. [from MeSH]

MedGen UID:
83084
Concept ID:
C0333641
Pathologic Function
6.

Macrocephaly

Enlargement of all or parts of the cerebral hemispheres. [from HPO]

MedGen UID:
65141
Concept ID:
C0221355
Congenital Abnormality; Finding
7.

Macrocephaly

Macrocephaly refers to an abnormally enlarged head inclusive of the scalp, cranial bones, and intracranial contents. Macrocephaly may be due to megalencephaly (true enlargement of the brain parenchyma), and the 2 terms are often used interchangeably in the genetic literature (reviews by Olney, 2007 and Williams et al., 2008). Autosomal recessive macrocephaly/megalencephaly syndrome is characterized by an enlarged cranium apparent at birth or in early childhood. Affected individuals have intellectual disability and may have dysmorphic facial features resulting from the macrocephaly (summary by Alfaiz et al., 2014). [from OMIM]

MedGen UID:
745757
Concept ID:
C2243051
Disease or Syndrome; Finding; Finding
8.

Megalencephalic leukoencephalopathy with subcortical cysts

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to the 98th percentile, usually several centimeters above it. Almost all individuals have epilepsy from an early age. Initial mental and motor development is normal in most cases. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Mental deterioration is late and mild. Severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their forties. An atypical improving phenotype has a similar initial presentation without mental or motor regression, followed by an improving clinical course: motor and cognitive functions improve or normalize; macrocephaly usually persists, but some children become normocephalic; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable with or without autism. [from GeneReviews]

MedGen UID:
500869
Concept ID:
CN176898
Disease or Syndrome
9.

Megalencephalic leukoencephalopathy with subcortical cysts 2a

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to the 98th percentile, usually several centimeters above it. Almost all individuals have epilepsy from an early age. Initial mental and motor development is normal in most cases. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Mental deterioration is late and mild. Severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their forties. An atypical improving phenotype has a similar initial presentation without mental or motor regression, followed by an improving clinical course: motor and cognitive functions improve or normalize; macrocephaly usually persists, but some children become normocephalic; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable with or without autism. [from GeneReviews]

MedGen UID:
462705
Concept ID:
C3151355
Disease or Syndrome
10.

Unspecified encephalopathy

Encephalopathy is a term that means brain disease, damage, or malfunction. In general, encephalopathy is manifested by an altered mental state. [from HPO]

MedGen UID:
39314
Concept ID:
C0085584
Disease or Syndrome
11.

Megalencephalic leukoencephalopathy with subcortical cysts 2b, remitting, with or without mental retardation

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to the 98th percentile, usually several centimeters above it. Almost all individuals have epilepsy from an early age. Initial mental and motor development is normal in most cases. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Mental deterioration is late and mild. Severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their forties. An atypical improving phenotype has a similar initial presentation without mental or motor regression, followed by an improving clinical course: motor and cognitive functions improve or normalize; macrocephaly usually persists, but some children become normocephalic; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable with or without autism. [from GeneReviews]

MedGen UID:
462706
Concept ID:
C3151356
Disease or Syndrome
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