Three children with dermoid cysts of the posterior fossa are reported from the Assaf Harofeh Medical Center, Zerifen, and Hadassa Medical Center, Jerusalem, Israel. Two presented with, acute meningitis at 1 and 2 yrs of age, and the third patient had hydrocephalus treated by ventriculo-peritoneal shunt at 7 mos and complicated by meningitis and cerebellar abscess at 9 mos of age. CT scans with enhancement and bone window setting revealed the midline bony defect and low density lesion with ring enhancement in the posterior fossa. 
COMMENT. Recurrent meningitis or brain abscess in an infant or young child should prompt a search for a sinus, fistula, and bone defect in the occipital area. Dermoid cysts of the cerebellum and posterior fossa account for 2% of intracranial tumors in children. Astrocytoma, medulloblastoma, brain stem glioma, and ependymoma of the IVth ventricle are the most frequently encountered IC tumors.