is a rare disorder causing gradual shrinking of tissues on one side.

is a rare disorder affecting brain white matter and ovarian function.

is a rare disorder with progressive microcephaly, seizures, cortical blindness, developmental delay.

is a rare, serious brain infection caused by JC virus.

is a rare motor neuron disease causing gradually worsening muscle weakness.

is a group of inherited disorders that cause worsening muscle weakness.

is a genetic epilepsy causing worsening seizures and muscle jerks (myoclonus).

is a rare inherited disorder causing seizures and sudden muscle jerks.

is a rare genetic epilepsy with progressive myoclonus (sudden jerks) and seizures.

is a rare genetic epilepsy causing worsening myoclonus, seizures, and coordination problems.

is a rare inherited epilepsy causing seizures, muscle jerks, and worsening coordination.

is a rare genetic epilepsy causing seizures, myoclonus, and progressive neurologic decline.

is a rare inherited epilepsy causing myoclonic seizures and progressive neurologic decline.

is a rare inherited epilepsy causing worsening seizures and muscle jerks (myoclonus).

is a rare disorder causing seizures, muscle jerks, and dystonia.

is a rare inherited disorder causing worsening seizures and nervous system decline.

is a rare group of disorders causing seizures, muscle jerks, and decline.

is a rare inherited disorder causing seizures, muscle jerks, and decline.

is a rare inherited disorder causing seizures, muscle jerks, and decline.

is a rare disorder causing steadily increasing skin and mucosal nodules.

is a condition causing gradually worsening speech and language difficulties.

is a rare spine condition causing gradual fusion of front vertebrae.

is a rare genetic disorder causing progressive bone formation in soft tissues.

is a fleshy eye growth that can slowly spread over the cornea.