We report a case of prenatal bladder obstruction due to a single system ureterocele
associated with hydrocolpos. Ultrasound at 22 weeks demonstrated an enlarged bladder.
Serial scans showed progressive ipsilateral obstructive uropathy, contralateral hydronephrosis,
and oligohydramnios. Neonatal endoscopic decompression and hymenotomy was performed
with residual decreased ipsilateral renal function and dilation. Prenatal bladder
obstruction may cause permanent renal damage.
Ureterocele - hydrocolpos - ultrasound