A cystic swelling that develops in the SCROTUM when URINE escapes from the URETHRA, usually after injury. Prompt treatment is necessary and this is done by diverting the urine by inserting a suprapubic catheter (see CATHETERS) into the URINARY BLADDER, draining the cystocele and giving the patients antibiotics. The injured urethra can be surgically repaired later.