megalencephaly
n. an abnormally large, heavy, and usually malfunctioning brain. Large head size (macrocephaly) may be present at birth, or the head may become enlarged in early childhood. Symptoms of megalencephaly can include delayed development, seizures, and corticospinal (brain cortex and spinal cord) dysfunction. Hemimegalencephaly is a rare condition that is characterized by the enlargement of one side of the brain. Children with hemimegalencephaly may have a large and asymmetrical head, seizures, partial paralysis, and intellectual disability. Also called megalocephaly. —megalencephalic
adj.