Right atrial mass after primary repair of an atrial septal defect: thrombus masquerading as a myxoma
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Updated: Jul 10, 2026

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
Published on: June 11, 2019
Ahmad Y Sheikh1, Sonja Schrepfer, William Stein
1Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract:
Atrial septal defects are among the most common congenital anomalies requiring surgical repair. Thrombus formation after patch-based repair is a recognized complication, usually manifested by an embolic event. However, thromboembolic complications after primary repair of atrial septal defects are exceedingly rare. We present a 38-year-old woman found to have a right atrial mass diagnosed as a myxoma by echocardiography and magnetic resonance imaging 3 years after primary atrial septal defect repair. However, final pathology revealed an organized thrombus. A review of the literature and clinical management of postoperative atrial thrombi are discussed.
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