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Return of gonadal function with resection of nonfunctioning pituitary adenoma.

A 42-year-old man with severe testicular failure (testosterone 24 ng/dl, normal 300-1100) was found to have a nonfunctioning chromophobe pituitary adenoma. Resection of the pituitary tumor resulted in recovery of gonadal function (testosterone 359 ng/dl). Hypogonadism caused by pituitary adenomas is usually attributed to either hyperprolactinemia or irreversible destruction of normal pituitary tissue, neither of which is applicable to this patient. The recovery of our patient's gonadal function after operation suggests that a reversible compression of viable tissue or impairment of hypothalamic-pituitary communications was responsible for his endocrine deficiency.