Pelvic endometriosis mimicking advanced ovarian cancer: presentation with pleural effusion, ascites, and elevated serum CA 125 level.

Two patients with clinical complications of endometriosis mimicking stage IV epithelial ovarian cancer are described. One had bilateral pleural effusions, ascites, and a serum CA 125 level of 440 U/ml. The other had a right-sided pleural effusion and a large abdominal mass.