<unk>  is a term derived from the Greek words "hydro" meaning water, and "cephalus" meaning head, and this condition is sometimes known as "water on the brain".  People with this condition have abnormal accumulation of cerebrospinal fluid (CSF) in the ventricles, or cavities, of the brain.  This may cause increased intracranial pressure inside the skull and progressive enlargement of the head, convulsion, and mental disability.
Hydrocephalus
Microcephaly
Acephaly 
Plagiocephaly
Subdural hygroma
Intraventricular hemorrhage
Brain zap
Encephalocele