Megalencephaly, polymicrogyria, and hydrocephalus (MPPH) syndrome is a syndrome that is characterized by the presence of polymicrogyria, megalencephaly, mental retardation, seizures, polydactyly, and hydrocephalus. The cause of the condition is currently unknown. 
What is (are) Megalencephaly, polymicrogyria, and hydrocephalus (MPPH) syndrome ?