Congenital Fetal Hydrocolpos with Vaginal Atresia

We report an unusual case of congenital hydrocolpos diagnosed at the third trimester. The antenatal diagnosis was not conclusive as the mass was very central and arising from the pelvis toward the fetal abdomen between the rectum and fetal urinary bladder. Noninvasive prenatal testing (NIPT) showed no abnormal chromosomes. Postnatal abdominal ultrasound was not conclusive. The final and correct diagnosis of congenital hydrocolpos and urogenital sinus with vaginal atresia was made on postnatal magnetic resonance imaging (MRI). Patient was examined under general anesthesia; there was a single genital opening and a normal anus (no vaginal opening). Both cystoscopy and tube vaginostomy were performed afterward to drain the hydrocolpos. The postnatal period was uneventful.