Patent urachus with subcutaneous communication and ventral abdominal swelling in a domestic short‐hair cat

Abstract A 3‐month‐old, male, entire, domestic shorthair kitten underwent investigations for stranguria and haematuria, and was diagnosed with a urinary tract infection secondary to a suspected extramural vesicourachal diverticulum. Lower urinary tract signs resolved with a 14‐day course of amoxicillin clavulanate. Three months later, the kitten re‐presented for investigation of acute onset ventral abdominal discomfort and bruising. On presentation, clinical examination revealed omphalitis and subcutaneous bruising, with no evidence of an umbilical stoma. Ultrasonography demonstrated a patent urachus communicating with the subcutaneous tissue space, resulting in accumulation of urine at the level of the umbilicus. A ventral midline coeliotomy was performed to allow resection of the urachal remnant, including a partial cystectomy. The cat was urinating normally within 10 hours postoperatively, and the wound healed without complication. No postoperative complications or recurrent lower urinary tract signs were reported at follow‐up (312 days).