CT pre-contrast T1 pre gad T1 post gad

Diagnosis: Ruptured dermoid

Dermoids are ectodermal inclusion cysts which contain dermal appendages & liquid cholesterol and are 4 to 9 times less common than epidermoids. They often rupture either into the ventricles or subarachnoid space producing a chemical meningitis which can be fatal. They usualy do not enhance, and may contain fat, hair or calcification as well. Epidermoid is not in the differential since those follow CSF on T1 and T2. and tend to be midline posterior fossa or parasellar. Lipomas do not rupture and are usually in association with the corpus callosum Related Cases

Schwannoma Pineal Epidermoid Suprasellar dermoid