Congenital hydrocolpos combined with unilateral renal agenesis

Herein we report an infantile case of congenital hydrocolpos combined with left renal agenesis which presented with an abnormal mass protruding from the vaginal introitus. The diagnosis was made shortly after birth by ultrasonography and confirmed by other radiologic diagnostic methods. This case highlights the value of ultrasonography in diagnosing hydrocolpos and determining the coexistence of renal anomalies.