Suprasellar arachnoid cyst - massive
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A massive suprasellar arachnoid cyst is demonstrated which bulges laterally into the middle cranial fossae and, superiorly elevating the floor of the third ventricle and chiasm up against the foramen of Monro and in fact, even narrowing the lateral ventricles, and inferiorly anterior to the basilar artery down to almost the pontomedullary junction. The pituitary infundibulum and supraclinoid internal carotid arteries are displaced anteriorly. There is no solid component, no calcification in the walls, and no internal structures to suggest an alternative diagnosis. No hydrocephalus of the lateral ventricles.
Some arachnoid cysts are truly massive. This individual is being observed with a plan for shunting.