Pituitary pseudotumor.

Non-tumoral aqueductal stenosis with hydrocephalus causes dilatation of the third ventricle. This in turn may compress the hypothalamus and optic nerves and erode the clinoids and enlarge the sella turcica. In female patients, amenorrhea or oligomenorrhea is the predominant endocrinologic symptom. Symptoms usually disappear after the drainage of cerebrospinal fluid. Third ventriculostomy by microtechnique was used for operative treatment of our three cases. In all of these, the hydrocephalus was arrested.