Cerebral cysticercosis is, unfortunately, a frequent disease in Korea. Cysts in the ventricular system are rarest form. They are most frequently observed in the fourth ventricle, more rarely in the lateral and third ventricles. The clinical picture of ventricular cystcercosis is that of increased intracranial pressure with hydrocephalus. Of the surgical interventions of cerebral cysticercosis most favorable result can be expected in this variety. Two cases of cysticercosis in the fourth ventricle were reported. Neither case had the hx. of T. Solium infestation nor typical blood and C.S.F. picture. The clinical picture was that of increased intracranial pressure with occasinal sudden hydrocephalic attack which usually lasted 24 hrs. The first case died abruptly because of sudden respiratory arrest.