Definition of Craniopharyngioma

Craniopharyngioma: A type of benign brain tumor that emerges develops from embryonic tissue that forms part of the pituitary gland. Pressure on the pituitary by the tumor reduces the availability of the hormone vasopressin, raising the pressure within the cranium. A craniopharyngioma usually includes hard, calcified components within the tumor itself, and disrupts normal skull development in its vicinity. Treatment is usually via surgery.