Abstract
An 11-year-old premenarcheal girl who has urinary retention was admitted to the urology department in our hospital. Her clinical examination revealed a palpable lower abdominal mass, and her tumor markers were highly elevated (CA19-9 and CA125). The urologist consulted our department, doubting an ovarian tumor. The mass was detected by ultrasonography. Hydrometrocolpos was diagnosed by the abdominal CT and MRI inspection. As a result of the examination of the vulva, it was diagnosed as hydrometrocolpos because of an imperforate hymen. We performed surgical treatment with a cross incision of the hymen followed by immediate leakage of 450ml of vaginal and uterine hemorrhagic collection. The postoperative course was excellent, her menstruation promptly ensued and her serum CA19-9 and CA125 levels decreased one month after the operation. Imperforate hymen is assumed to be a comparatively rare disease. However, it is possible to diagnose it easily by examining the vulva. It seems important to keep this disease in mind when examining a lower abdominal mass in girls before their first menstruation.
