Endometriosis-induced massive hemoperitoneum misdiagnosed as ruptured ectopic pregnancy: a case report.

Background: Endometriosis, an estrogen-dependent inflammatory disease, is commonly observed in gynecologic practice. Spontaneous hemoperitoneum is a rare but serious complication of endometriosis. Most cases of endometriosis-induced hemoperitoneum are attributable to a ruptured endometrioma or utero-ovarian vessel hemorrhage.