Abstract
A 73-YEAR-OLD MAN presented to the authors' hospital with chest pain at rest and a 2-month history of increasing shortness of breath. Twelve years earlier, he had undergone coronary artery bypass graft surgery with a left internal mammary artery graft to the left anterior descending artery and a saphenous vein “Y” graft to the posterior descending artery (PDA) and the posterior-lateral ventricular (PLV) branch of the right coronary artery (RCA). A chest radiograph showed moderate cardiomegaly and the absence of mediastinal widening. Preoperative transthoracic echocardiography revealed severe hypokinesia of the basal inferior wall and the basal inferior septum and a 3.3 × 4.8 cm, sessile, nonobstructive, immobile mass protruding into the right atrium and right ventricle. The mass did not appear to impede blood flow across the tricuspid valve (Fig 1 and Video 1 [supplementary videos are available online]). What is the diagnosis?
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