Partially calcified organized thrombus of the right atrium mimicking a cardiac tumor: a case report.

Partially calcified organized thrombi of the right atrium are rare and may mimic cardiac tumors, making preoperative diagnosis challenging. A 60-year-old man was found to have a partially calcified right atrial mass during evaluation for atrial flutter. Despite anticoagulation therapy, the lesion persisted and a neoplastic process could not be excluded. Therefore, surgical resection was performed through a right mini-thoracotomy approach. Histopathological examination revealed a chronic organized thrombus with focal calcification and hemosiderin-laden macrophages. The postoperative course was uneventful, and no recurrence was observed during 2 years of follow-up. This case highlights the diagnostic challenge of partially calcified right atrial masses and suggests that a minimally invasive approach may provide a useful option for both diagnosis and treatment in selected patients.