A Rare Case of Fetal Hydrocolpos Secondary to Low Vaginal Atresia

Abstract

Abstract Female urogenital anomalies are often difficult to evaluate by ultrasonography, especially in late gestation. We report a case of fetal hydrocolpos detected by a fetal medicine scan at 33 weeks of gestation. Antenatal ultrasound by the fetal medicine unit showed a singleton fetus with a huge retrovesical cystic mass extending from the mid-abdomen to the perineum. Bilateral hydronephrosis was noted. Postnatal ultrasound showed the findings of a markedly dilated vagina containing thick echogenic fluid that was extended up to the umbilical level displacing the urinary bladder upwards and anteriorly and rectum posteriorly, suggesting hydrocolpos. Bilateral hydronephrosis was also noted. Postnatal examination of the neonate showed a distended abdomen with a well-defined mass arising from the pelvis extended to the umbilicus. External genitalia were of a normal female. There were no other dysmorphic features. Hydrocolpos was secondary to low vaginal atresia. Aspiration of the mass was performed on the first postnatal day.