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LH- and FSH-secreting pituitary adenoma in a postmenopausal woman.

Gonadotropin secreting pituitary adenomas have been reported with increasing frequency in men, but they are still rarely recognized in women. We report a 52-year-old postmenopausal woman with LH- and FSH-secreting pituitary adenoma. She had increased LH (37.0 +/- 13.7 IU/l) (mean +/- SD) and FSH (109.9 +/- 26.7 IU/l) but these concentrations were within normal ranges in 80 postmenopausal women (LH: 29.7 +/- 18.3 IU/l, FSH: 104.0 +/- 43.9 IU/l). The administration of GnRH and conjugated estrogen resulted in normal response of LH and FSH. No abnormal response of gonadotropin to TRH and bromocriptine was observed. After transsphenoidal adenomectomy both LH and FSH decreased (LH: 11.1 +/- 4.2 IU/l, FSH: 37.0 +/- 9.6 IU/l). An immunocytochemical study revealed that the adenoma cells synthesize both LH and FSH. The rarity of gonadotropin secreting pituitary adenomas in women could be the result of greater difficulty in recognition due to an increase in serum gonadotropin in postmenopausal women.