Preoperative ultrasound of the right (A) and left (B) kidneys show moderate hydronephrosis (asterisk). Image C is a retrograde cystogram and shows signs of outlet obstruction including a small volume hypertrophied bladder with a diverticulum (arrow) and trabeculation of the bladder wall (arrowhead). Post-prostatectomy ultrasound of the right kidney (D) shows resolution of the hydronephrosis. There is mild residual hydronephrosis of the left kidney (arrow).
