Abnormally large brain; this can lead to delayed development, convulsive disorders, corticospinal (brain cortex and spinal cord) dysfunction, and seizures. Also called Macroencephaly.

Dictionary of mental handicap, M Lindsey Having a brain of unusually large size.

Megalencephaly is a type of cephalic disorder. Also called macrencephaly, this is a condition in which there is an abnormally large, heavy, and usually malfunctioning brain. By definition, the brain weight is greater than average for the age and sex of the infant or child.

An enlargement of the head.