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MRI confirms the cystic nature of the mass with low T1 and high T2 central fluid component. Thin peripheral enhancement is present but no solid component. The mass extends directly superiorly and displaces the optic chiasm, elevating the floor of the third ventricle. Inferiorly it expands the fossa and presses the pituitary inferiorly. An incidental cavum septum pellucidum is noted.