Giant Left Atrial Appendage Aneurysm Mimicking Mediastinal Mass and Associated with Incessant Atrial Arrhythmias
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Updated: Feb 16, 2026

The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
Published on: February 28, 2012
Joëlle Morin1, Luce Cantin1, Sergio Pasian1
1Institut universitaire de cardiologie et de pneumologie de Québec, Quebec, Canada.
Abstract:
Left atrial appendage aneurysm (LAAA) is a rare entity. Clinical manifestations include arrhythmias and systemic embolization. We show here an example of a large and ectopic LAAA mimicking a mediastinal mass on chest X-ray and presenting with incessant atrial arrhythmias. Subsequent investigations leading to the correct diagnosis are described.
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