Astrocytoma is a type of brain tumor that begins in the astrocytes, a type of glial cell in the brain. Astrocytomas can be either low-grade (grade I or II) or high-grade (grade III or IV). Low-grade astrocytomas tend to grow slowly and may not cau...

Ataxia telangiectasia (AT) is a rare, inherited, neurodegenerative disorder that affects the nervous system, immune system, and other body systems. It is characterized by progressive difficulty with balance and coordination, telangiectasias (dilat...

Ataxia with Vitamin E Deficiency (AVED) is a rare, inherited disorder caused by a deficiency of the vitamin E. It is characterized by progressive difficulty with coordination and balance, as well as muscle weakness and vision problems. People with...

Ataxia-deafness-intellectual disability syndrome (ADID) is a rare genetic disorder characterized by progressive ataxia (loss of coordination), hearing loss, and intellectual disability. It is caused by a mutation in the GJB2 gene, which is respons...

Ataxia-hypogonadism-choroidal dystrophy syndrome is a rare genetic disorder characterized by a combination of ataxia (lack of muscle coordination), hypogonadism (underdeveloped reproductive organs), and choroidal dystrophy (a degenerative eye diso...

Ataxia-intellectual disability-oculomotor apraxia-cerebellar cysts syndrome (AICC) is a rare genetic disorder characterized by intellectual disability, ataxia, oculomotor apraxia, and cerebellar cysts. It is caused by a mutation in the gene encodi...

Ataxia-oculomotor apraxia type 1 (AOA1) is a rare, inherited neurological disorder that affects the brain and nervous system. It is characterized by progressive ataxia (lack of muscle coordination), oculomotor apraxia (inability to move the eyes i...

Ataxia-oculomotor apraxia type 4 (AOA4) is a rare, inherited neurological disorder caused by mutations in the SETX gene. It is characterized by progressive ataxia (lack of muscle coordination) and oculomotor apraxia (inability to move the eyes in ...

Ataxia-pancytopenia syndrome is a rare genetic disorder characterized by a combination of ataxia (lack of muscle coordination) and pancytopenia (low levels of all types of blood cells). It is caused by mutations in the gene encoding the enzyme ade...

Ataxia-photosensitivity-short stature syndrome (APSS) is a rare genetic disorder characterized by ataxia (lack of muscle coordination), photosensitivity (sensitivity to light), and short stature. It is caused by a mutation in the ATXN2 gene, which...

Ataxia-tapetoretinal degeneration syndrome (ATD) is a rare genetic disorder that affects the eyes and nervous system. It is characterized by progressive vision loss, ataxia (lack of muscle coordination), and retinal degeneration. Symptoms usually ...

Ataxia-telangiectasia variant (ATV) is a rare genetic disorder that is characterized by a combination of neurological and immunological symptoms. It is caused by a mutation in the ATM gene, which is responsible for the production of a protein that...

Ataxia-telangiectasia-like disorder (ATLD) is a rare genetic disorder that is characterized by progressive neurological problems, including ataxia (loss of muscle coordination), telangiectasia (dilated blood vessels), and immunodeficiency. It is c...

Atelencephaly is a rare and fatal neurological disorder that is characterized by the absence of a large portion of the brain, including the cerebrum and cerebellum. It is a type of anencephaly, a disorder in which the brain does not develop proper...

Atelosteogenesis type I is a rare genetic disorder that affects the development of bones in the body. It is caused by a mutation in the SLC26A2 gene, which is responsible for the production of a protein called anion exchanger 2. This protein is im...

Atelosteogenesis type II is a rare genetic disorder that affects the development of bones in the body. It is caused by a mutation in the SLC26A2 gene, which is responsible for the production of a protein called anion exchanger 2. This protein is i...