NAVLE（北美执业兽医考题）Day 658

A five-year-old domestic short-haired spayed female cat is presented with the complaints of anorexia, chronic vomiting, and weight loss. Physical examination reveals icterus, dehydration, and fever. Thickened small intestinal loops are appreciated with abdominal palpation, and serum biochemistry shows increased bilirubin and liver enzymes. The cat is diagnosed with extrahepatic biliary obstruction with accompanying cholangitis and inflammatory bowel disease. Which one of the following normal anatomic features may predispose cats to this triad of diseases？
一只五岁的雌性已绝育家养短毛猫因厌食、慢性呕吐和体重下降而前来就诊。体格检查显示黄疸、脱水和发烧。腹部触诊可见肠道粘膜增厚，血清生化显示胆红素和肝酶升高。猫被诊断为肝外胆道梗阻，伴有胆管炎和炎症性肠病。下列哪一种正常的解剖特征是猫易患这三种疾病的可能原因？