A 77-year-old woman was hospitalized for acute decompensated heart failure due to
paroxysmal atrial fibrillation (AF) with rapid ventricular response. Transesophageal
echocardiography (TEE) was performed prior to electrical cardioversion because a left atrial
appendage (LAA) thrombus had been described 3 years earlier. Right next to the left atrium,
an echogenic, multilobulated, partially mobile mass, similar to the one previously reported,
was visualized (Fig. 1A, B; Suppl. Video 1). However, on closer examination, the cavity …