Asymmetry of cerebral hemispheric growth with atrophy on one side, ipsilateral osseous hyper t rophy and hyperpneumatizat ion of sinuses with contralateral paresis are features of Dyke Davidoff Mason Syndrome (DDMS). 1 Vary ing deg ree of hemipa re s i s , herniplegia , men ta l retardation and facial asymmetry may be found. deve lop h e m i p a r e s i s af ter the age of 2 years and in absence of prolonged or recurrent seizures. Children with intractable disabl ing seizures and hemipleg ia m a y be candidates for hemisphrectomy, which is successful in eliminating or substantially reducing seizures in 85 % of carefully selected cases. 5