Two Cases of Imperforate Hymen Presenting as Ischuria and Lower Abdominal Mass

Ryosuke Noguchi, Takahiko Nakazono, Shino Imai, Yuhei Hamasaki1）,
Tuyoshi Iwasaka2）, Sho Kudo

Department of Radiology, Pediatrics1）, and Gynecology2）, Saga Medical School

Abstract
We report two cases of imperforate hymen with hematocolpos. Both patients were adolescent females. They complained of ischuria and lower abdominal mass. They presented at our hospital with the diagnosis of ovarian tumor. We performed ultrasonography(US) and MRI and diagnosed imperforate hymen in both cases. A hymenal incision was performed and the postoperative course was uneventful.
　　Imperforate hymen is a rare condition, its incidence reported to be 0.014 to 0.024％. It can be diagnosed by the patient's symptoms and physical examination, but it is sometimes found in the process of differential diagnosis for lower abdominal mass in a child or an amenorrheic adolescent female. US and MRI are useful for the diagnosis, clearly showing a dilated and obstructed vagina.

Keywords：Imperforated hymen, MRI, US