Dermoid cyst with rupture into the subarachnoid space


Intracranial dermoid cysts are uncommon lesions with characteristic imaging appearances. They can be thought of as along the spectrum from epidermoid cysts at one end and teratomas at the other.

They are typically midline tumors, with no enhancement and, unlike intracranial lipomas which follow fat density on all sequences, dermoids have more variable signal characteristics.