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In the suprasellar cisternal/planum sphenoidale an extra-axial high T1 signal mass measuring 3.5 x 2.5 x 2.1 cm which is consistent with the known history of prior resection of a dermoid cyst. There is extensive spread of T1 hyperintense material throughout the subarachnoid space consistent with rupture. Following administration of contrast, no solid enhancing component can be identified and minimal if any leptomeningeal enhancement. The pituitary fossa and pituitary gland appear normal. Ventricles are unremarkable in size, and posterior fossa is normal. Note is made of a prior right-sided craniotomy.
Characteristic appearances of a suprasellar dermoid cyst with rupture into the subarachnoid space.