Delayed chiasmal herniation after transsphenoidal removal of a pituitary adenoma - case report.

We report a 41-year-old woman who experienced visual deterioration after successful removal of a pituitary adenoma. Possible mechanisms of this visual deterioration and contribution of chiasmal herniation into the sella as well as defect in the diaphragma sellae are discussed with emphasis on the regulation of medical treatment for pituitary adenomas. We conclude that medical therapy after pituitary surgery should be carefully managed together with periodic visual examinations.