Occipital dermoid cyst associated with dermal sinus and cerebellar abscesses.

sinus is a rare entity, with fewer than 20 cases reported in the literature1. We describe the unique computed tomogram (CT) and magnetic resonance (MR) imaging findings of an infant presenting with cerebellar abscesses and secondary obstructive hydrocephalus resulting from an occipital dermoid cyst with a complete dermal sinus, confirmed at operation. Early neurosurgical intervention is advocated to prevent the ongoing risk of significant complications, including cerebellar abscess formation, hydrocephalus and bacterial meningitis. The importance of cross sectional imaging in the assessment of dural venous sinus anatomy in relation to the pre-operative planning of posterior fossa dermoid cysts is discussed.