Choledochoduodenostomy for the treatment of extrahepatic bile duct carcinoma in a cat

This paper reports a case of feline cholangiocarcinoma, a relatively rare condition in veterinary clinical practice. A 4-year-old female British Shorthair cat was presented with a 10-day history of anorexia and lethargy. An irregularly shaped mass was palpable on abdominal palpation. Diagnostic imaging and serum biochemical findings indicated extrahepatic biliary obstruction, and the diagnosis of cholangiocarcinoma was confirmed by histopathology and immunohistochemistry. Preoperative imaging in this cat indicated that the mass had not invaded major blood vessels such as the portal vein, and no evidence of distant metastasis was detected. The mass was surgically resected, followed by choledochoduodenostomy. The cat regained appetite on postoperative day 1, jaundice resolved within 48 hours, and biochemical parameters returned to normal by postoperative day 4. The cat was discharged 10 days after surgery, and no recurrence or metastasis was identified during the 3-month follow-up. This case documents the diagnostic and surgical management of feline extrahepatic cholangiocarcinoma and the short-term outcome following mass resection and biliary reconstruction.