A 3-year-old castrated male domestic shorthair cat was presented for evaluation of acute onset tachypnea, dyspnea, and restlessness. Blood analysis revealed markedly elevated creatinine kinase, troponin, and D-dimers, together with azotemia and an inflammatory leukogram. Ultrasonography identified cardiomegaly with pericardial and pleural effusion. Thoracocentesis identified a high protein transudate. Cardiac computed tomographic angiography (CTA) identified an enlarged left auricle containing a non-contrast enhancing mass measuring 1.6 × 1.2 × 1.2 cm subsequently confirmed to be a thrombus. The cat underwent a left cardiac auriculectomy and was discharged on clopidogrel. Post-operative complications, including late-onset hemothorax and dyspnea, were managed to resolution.
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