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Residual anterior pituitary function following transsphenoidal resection of pituitary macroadenomas.

A series of 84 patients with pituitary adenomas greater than 1 cm in diameter is presented. Full preoperative and postoperative endocrine evaluations were carried out, and the effects of transsphenoidal surgery on remaining anterior pituitary function were analyzed. Of the patients who had normal anterior pituitary function before surgery, 78% retained normal function after surgery. Thirty-three percent of those patients with pituitary deficits who did not have panhypopituitarism before surgery had improved function after surgery; 33% had worsened function after surgery. None of the patients with panhypopituitarism before surgery regained function after surgery. Transsphenoidal surgery carries an acceptable risk for sacrificing anterior pituitary function, but the risk is greater in patients with larger tumors and preoperatively compromised pituitary function.