An ectopic ureter inserting into epididymis combined with ipsilateral duplex kidney in a boy diagnosed by MRI: report of a rare case.

We present the first case of a right ectopic ureter ending in epididymis combined with an ipsilateral complete duplex kidney, presenting with painless right scrotal mass and demonstrated by magnetic resonance imaging (MRI). The boy was initially diagnosed as right testicular teratoma by ultrasound, and then underwent surgical treatment. Because of recurrence of right scrotal swelling 1 year later, MR scan was performed. MR images with body coil displayed the entire ectopic ureter, and MR images with small surface coil clearly showed anatomic details of right ureteral ectopia into epididymis. Delayed-enhanced MRI showed contrast agent in the right dilated epididymis. The boy finally received the curative right upper pole nephronureterectomy.