Rare MALFORMATIONS OF CORTICAL DEVELOPMENT, GROUP I characterized by the enlargement of one side of the brain. It is associated with seizures, partial paralysis, and mental retardation.

Synonyms: Hemimegalencephalies, Unilateral Macrocephalies, Unilateral Megalencephalies, Megalencephaly, Unilateral, Macrocephalies, Unilateral, Hemimegalencephaly, Macrocephaly, Unilateral, Megalencephalies, Unilateral, Unilateral Megalencephaly, Unilateral Macrocephaly