1) Ablation 2) Cutting out 3) Excision 4) Extirpation 
Hypophysectomy is the surgical removal of the hypophysis (pituitary gland). It is most commonly performed to treat tumors, especially craniopharyngioma tumors. Sometimes it is used to treat Cushing`s syndrome due to pituitary adenoma. It is also applied in neurosciences (in experiments with lab animals) to understand the functioning of hypophysis....
<procedure> Surgical removal or destruction of the hypophysis, or pituitary gland. ... (12 Dec 1998) ... 
(hi-pof″ә-sek´tә-me) removal of part or all of the pituitary gland (hypophysis); this is usually a surgical procedure but is sometimes done chemically by injection of alcohol into the sella turcica. The primary indication is as treatment of a pituitary tumor. Because of its influence on the adrenal cortex an...
Removal of the pituitary gland
Type: Term Pronunciation: hī′pof-i-sek′tŏ-mē Definitions: 1. Surgical removal of the hypophysis or pituitary gland.
[n] - surgical removal of the pituitary gland
noun surgical removal of the pituitary gland
excision of the pituitary gland.