Urinary retention of unusual proportions. The urinary bladder was not perforated, but the tension of the abdominal skin looks impressive. Incipient phlegmon.In volume terms, the largest urinary retention I've seen in 30 years of practice. An urinary retention occurs when the bladder can not be emptied willfully or reflexively, even though it is full. The person concerned feels the urge to urinate, but can not empty the bladder. When the bladder is full, the closing force of the bladder sphincter is overcome, which results in so-called dribbling or overflow incontinence.The urinary retention can sometimes cause severe pain because of the overstretched bladder..Therapy: Drainage via catheter or suprapubic catheter.