NAVLE（北美执业兽医考题）Day 363

Q1:A 11-year old male castrated Golden Retriever presents for collapse with muffled heart sounds on examination. You ultrasound the heart and obtain the following image; the right atrium (RA) and right ventricle (RV) are labeled. A large mass is seen in the right atrioventricular groove with pericardial effusion. What is the likely diagnosis?一只11岁的雄性已绝育金毛犬由于虚脱前来就诊，体格检查时发现其心音模糊。你给他做了心脏超声，看到了如下图的画面，右心房和右心室已标记出。可见房室沟处有一巨大肿块，并且发现了心包积液。最可能的诊断是什么？[图片]