Fetal hydrometrocolpos: Challenges of prenatal differential diagnosis on ultrasound

Hydrometrocolpos is a pelvic cystic mass representing the distension of the vagina and uterus due to a lower genital tract obstruction causing accumulation of utero-cervical-vaginal secretions or urine in the vagina and endometrial cavity. Prenatal diagnosis is uncommon and differential diagnosis of the underlying etiologies is quite challenging in the prenatal period. We present three cases of female fetuses with hydrometrocolpos and discuss the prenatal differential diagnoses in the light of ultrasound findings along with postnatal diagnoses and outcomes.