MSH: A form of stimulus sensitive myoclonic epilepsy inherited as an autosomal recessive condition. The most common presenting feature is a single seizure in the second decade of life. This is followed by progressive myoclonus, myoclonic seizures, tonic-clonic seizures, focal occipital seizures, intellectual decline, and severe motor and coordination impairments. Most affected individuals do not live past the age of 25 years. Concentric amyloid (Lafora) bodies are found in neurons, liver, skin, bone, and muscle (From Menkes, Textbook of Childhood Neurology, 5th ed, pp111-110),NCI: A rare, fatal autosomal recessive inherited disorder caused by mutations in the genes EPM2A and EPM2b. It is characterized by the presence of cytoplasmic inclusion bodies called Lafora bodies in many cells of the body including neurons, muscle cells, and liver cells. The Lafora bodies contain mucopolysaccharides. Signs and symptoms include seizures, myoclonus, ataxia, and dementia.