J Cardiol Cases. 2025 Aug 5;32(6):221-223. doi: 10.1016/j.jccase.2025.07.005. eCollection 2025 Dec.
ABSTRACT
A 57-year-old female patient presented with dyspnea. Chest radiography revealed pulmonary congestion and bilateral pleural effusion. Electrocardiogram revealed sinus tachycardia. Transthoracic echocardiography revealed a large mass measuring 32 × 25 mm in the left atrium that caused mitral valve obstruction during diastole. Emergency surgery was performed, and the mass was found to be a hematoma encapsulated by a thin membrane-like organized thrombus. No atrial fibrillation or coagulation abnormalities were observed during follow-up.
LEARNING OBJECTIVE: A ball-shaped left atrial thrombus without atrial fibrillation or mitral stenosis is a rare lesion. Previous studies have not reported a large left atrial hematoma encapsulated by a thin membrane-like organized thrombus. Blood flow into the left atrial mural thrombus may have caused the rapid enlargement of the large, ball-shaped left atrial thrombus.
PMID:41427431 | PMC:PMC12717546 | DOI:10.1016/j.jccase.2025.07.005