Following the thread: an unexpected cause of atrial fibrillation.

Abstract

901 tumor not enhanced by contrast media (diame‐ ter, 63 mm) in the posterior mediastinum. The tu‐ mor compressed the upper surface of the left atri‐ um and the inferior wall of the right pulmonary artery causing blood flow limitation. Additional‐ ly, enlargement of subcarinal, lower paratrache‐ al, and right hilar lymph nodes was diagnosed. At that time, inflammatory markers were with‐ in the reference range. In the thoracic surgery de‐ partment, after bronchoscopy and endobronchial A 33 ‐year ‐old man, not treated before, had a his‐ tory of one episode of atrial fibrillation (AF). A tumor behind the left atrium was revealed in a transthoracic echocardiogram (FIGURE 1A–C). The patient was admitted to the hospital, where a thoracic X ‐ray showed linear and nodular opac‐ ities in the superior segments of the upper lobes suggesting inactive tuberculosis. A thoracic com‐ puted tomography (CT) and magnetic resonance (MRI) were performed, and revealed a benign CLINICAL IMAGE