Inguinal Bladder Herniation: An Unexpected Finding on Tc-99m MAG-3 Renogram

Herniation of bladder into the inguinal canal is a rare occurrence. The diagnosis is rarely made preoperatively as patients typically lack symptoms referable to the urinary tract. Unfortunately, 10% to15% of all bladder hernias are first recognized as postoperative complications after injury to the bladder that occurs during herniorrhaphy or other pelvic surgery. Consequently, recognizing this entity on preoperative imaging is imperative. We present the imaging findings of inguinal bladder herniation incidentally discovered in a 1-month-old infant (born prematurely at 24-week gestation) who underwent a technetium-99m MAG-3 renogram for evaluation of in utero hydronephrosis.