Right atrial thrombi can mimic myxomas in patients with pacemakers and can be successfully managed with surgical excision.
Right atrial thrombi should be considered in pacemaker patients with myxoma-like masses; this case leaves open reliable noninvasive differentiation.
A patient who had a VVI pacemaker implanted 4 years ago presented with exertional dyspnea. He was found to have a large mobile ovoid mass in the right atrium attached to the lateral atrial wall apart from the pacing electrode. The tumor resembling a myxoma was removed successfully under cardiopulmonary bypass and found to be an organized thrombus.
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Moriyama et al. (2005) studied this question.
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