Impotence as a presenting symptom of presumed prolactinoma in a patient with diabetes mellitus.

Impotence in diabetic men is usually considered to be due to neuropathic factors or vascular insufficiency. However, factors unrelated to diabetes may occasionally produce sexual dysfunction in these patients. Recently, a diabetic patient presented to our clinic with the complaint of impotence. In this patient, macroprolactinemia was discovered. With appropriate therapy, the sexual dysfunction improved and this case is reported here.