Selection of the best approach to evaluation and management of an incidentally identified intracardiac mass can be complicated. Thus, it is conceivable that doing so in the context of an acute myocardial infarction in a patient that required 4 drug-eluting stents (DESs) and dual antiplatelet therapy (DAPT) can be even more daunting. This unique case reflects the invaluable role of noninvasive multimodality imaging in the comprehensive diagnosis and characterization of an intracardiac mass, the need for optimization of guidelines regarding early intervention, and the challenge posed by management of a cardiac mass in the setting of concurrent acute coronary thrombosis requiring DAPT.

Chemodectoma is a common cardiac neoplasia in dogs.1-4 It may be diagnosed incidentally on echocardiography, and a common clinical consequence of this neoplasia is pericardial effusion with or without cardiac tamponade.3,5,6 Rarely, compression of the pulmonary artery or its branches by this neoplasia has been described in dogs.7,8 Here we present a case of a chemodectoma causing acquired pulmonary valvular obstruction in a dog, with subsequent treatment using transvalvular pulmonary stent angioplasty.