. Endometriosis was identified at laparoscopy in 46 (81%) of 57 patients who failed to respond to hormonal therapy compared with 41 (87%) of 47 patients who previously responded to hormonal therapy (p = .37). Using final pathology as basis of diagnosis, 31 (67%) of 46 responders, and 39 (68%) of 57 nonresponders had endometriosis (p = .91). When data were analyzed by anatomic site of endometriosis, no significant difference was noted in response to preoperative hormonal therapy.