Urinary bladder rupture in a two-year-old horse: sequel to a surgically repaired neonatal injury.

After routine cryptorchid castration, a 2-year-old Thoroughbred colt was admitted 72 hours later because of depression, abdominal distention, and pollakiuria, with production of small quantities of urine. A diagnosis of a ruptured bladder was made on the basis of a large volume of abdominal fluid and a disparity between the urea nitrogen and creatinine concentrations in the serum (70 mg/dl and 8.4 mg/dl, respectively) and in the abdominal fluid (154 mg/dl and 43 mg/dl, respectively). The colt had undergone surgical correction of a ruptured urinary bladder at 4 days of age, and a 5-cm tear through one of the previous scars was identified and repaired during exploratory celiotomy. The previous injury to the bladder was extensive and may have left an inherent weakness in the bladder wall. Evidence of adhesion formation or urethral obstruction was not found. The combination of a full bladder and the trauma associated with induction of anesthesia may have contributed to the recurrence of bladder rupture.