Ultrasonic evaluation of congenital vaginal oblique septum syndrome: A study of 21 cases.

The aim of the present study was to investigate the ultrasound features and classify the lesion types of congenital vaginal oblique septum syndrome (CVOS) in 21 patients prior to surgery. Grey-scale pelvic ultrasound was performed to evaluate the uterus, vagina and kidneys in 21 patients with suspected CVOS. Ultrasound features, including the presence of a double uterus, hematocolpos masses and renal absence, in CVOS types I, II and III were studied and compared with intra-operative results and the results of surgery. Ultrasound identified the presence of double uteruses and cervices with ipsilateral renal agenesis on the oblique septum side in all 21 patients. There were 14 hematocolpos lesions on the right and 7 on the left of the vagina. Type I CVOS was diagnosed in 15 patients with a large hematocolpos mass (volume, 64-268 ml) and these diagnoses were confirmed by surgery. Furthermore, there were 4 patients with type II and 2 patients with type III CVOS exhibiting small hematocolpos lesions (volume, 5-36 ml) identified by ultrasound, which were all confirmed by surgery. Therefore, ultrasound imaging is useful tool to evaluate the abnormal features of CVOS and determine the type of CVOS in patients prior to surgical intervention.