Estrogen-secreting adrenal tumor responsive to ACTH: localization by adrenal venous sampling.

In a 48-year-old man with gynecomastia but no other signs of feminization, routine evaluation revealed only minimally elevated serum estrogens. The diagnosis of an estrogen-secreting adrenal tumor was suggested by CT and confirmed by adrenal venous sampling. This tumor was found to be ACTH-responsive. Results in this patient are compared with those in normal volunteers, in whom adrenal venous sampling failed to localize estrogen secretion and in whom ACTH did not increase estrogens.