Key result
CMR identifies an incidentally discovered left atrial mass as an inverted left atrial appendage.
Why the study?
Inverted left atrial appendage mimicking a tumor has been reported mainly after cardiac surgery, but cases without prior surgery are rare and require diagnostic clarification.
Case Report (n=1)
Inverted LAA may mimic LA mass on echo without surgical history; leaves open MRI validation in larger cohorts.
We report a rare case of an inverted left atrial appendage without prior cardiac surgery. A left atrial mass was incidentally found during routine echocardiography in a 19-year-old man with mitral valve prolapse. Echocardiography revealed a hyperechoic mass in the left atrium, and a neoplastic lesion could not be excluded. On magnetic resonance imaging (MRI), this mass consisted of fat tissue that showed continuation to epicardial fat, indicating an inverted left atrial appendage mimicking a tumor in the left atrium. When a mass in the left atrium is observed on echocardiography, there are several differential diagnoses, including thrombus, vegetation, and intra-atrial neoplasms such as myxomas. Recently, several studies reported cases with inverted left atrial appendages mimicking tumors in patients after cardiac operations. We present a case of inverted left atrial appendage without any prior cardiac surgery. Cardiac MRI was highly useful to obtain the final diagnosis of inverted left atrial appendage.
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Motoyasu et al. (2003) conducted a case report in Inverted left atrial appendage (n=1). Cardiac magnetic resonance imaging (MRI) was evaluated on Final diagnosis of the left atrial mass. Cardiac magnetic resonance imaging successfully diagnosed an incidentally discovered left atrial mass as an inverted left atrial appendage in a patient without prior cardiac surgery.
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