Endometriosis-induced hemoperitoneum in the colonic serosa

Endometriosis is an inflammatory disease. The etiology of endometriosis is exactly unknown. A 42-year-old virgin experienced a sudden increase in pain that began one day prior to examination. She had been suffering from dysmenorrhea and menorrhagia. The patient had abdominal guarding with severe rebound tenderness. On computed tomography, both ovaries were normal, and sigmoid colon was seen in the peripheral portion of the pelvic hematoma. Pathologic findings revealed endometriosis in the colonic serosa cyst. Our data provide a new diagnostic key for hemoperitoneum caused by endometriosis in the colonic serosa.   Key words: Hemoperitoneum, endometriosis, colon.