<unk>  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. Head enlargement may be evident at birth or the head may become abnormally large in the early years of life.
Symptoms of<unk>  may include delayed development, convulsive disorders, corticospinal (brain cortex and spinal cord) dysfunction, and seizures.<unk>  affects males more often than females.
The prognosis for individuals with<unk>  largely depends on the underlying cause and the associated neurological disorders. Treatment is symptomatic.<unk>  may lead to a condition called macrocephaly. Unilateral<unk>  or hemimegalencephaly is a rare condition characterized by the enlargement of one-half of the brain. Children with this disorder may have a large, sometimes asymmetrical head. Often they suffer from intractable seizures and mental retardation. The prognosis for those with hemimegalencephaly is poor.
The prognosis for hemimegalencephaly ranges from poor to highly functioning.  In some cases, children with hemimegalencephaly are severely mentally retarded and must undergo a hemispherectomy to stop seizure activity.  In others, seizure activity can be controlled by medication; and the affected child develops mentally and physically trailing normal development by 1-2 years.
Megalencephaly
Schizencephaly
Hydranencephaly
Holoprosencephaly
Lissencephaly
Anencephaly
Spina bifida
Deformational plagiocephaly