Myoclonic Epilepsies, Progressive

**Definition:** A heterogeneous group of primarily familial EPILEPSY disorders characterized by myoclonic seizures, tonic-clonic seizures, ataxia, progressive intellectual deterioration, and neuronal degeneration. These include LAFORA DISEASE; MERRF SYNDROME; NEURONAL CEROID-LIPOFUSCINOSIS; sialidosis (see MUCOLIPIDOSES), and UNVERRICHT-LUNDBORG SYNDROME.

**Tree numbers:** - C10.228.140.490.375.130.650 - C10.228.140.490.493.063.650

**Synonyms:** - Progressive Myoclonus Epilepsies - Progressive Myoclonic Epilepsy - Myoclonic Epilepsy, Progressive