NAVLE（北美执业兽医考题）Day 585

An 8-year-old male neutered domestic shorthair cat is presented with a 1-month history of progressive exercise intolerance, panting, anorexia, weight loss and vomiting. On physical exam there is moderate cyanosis and a jugular pulse. On chest auscultation there is a systolic murmur loudest on the left side between the 5th and 6th intercostal space. A DV chest radiograph looks like the image below. What is the diagnosis?一只8岁的雄性已绝育家养短毛猫最近一个月出现进行性的运动不耐受，喘，厌食，体重减轻和呕吐。体格检查发现其中度发绀并出现颈动脉搏动。胸腔听诊发现明显的收缩期心杂音，杂音最强部位位于第五，第六肋间。其背腹位X光片如下图。你的诊断是什么？