Related Experiment Video
Updated: May 8, 2026

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
Published on: June 11, 2019
Thrombus in the left atrial septal pouch mimicking myxoma
Keiko Shimamoto1, Takuji Kawagoe, Kazuoki Dai
1The Department of Cardiology, Hiroshima City Hospital, Hiroshima, Japan.
Abstract:
A 15 × 13 mm mobile ovoid mass attached via a 15 × 5 mm stalk to the interatrial septum in the left atrium was detected on transesophageal echocardiography and was diagnosed as a myxoma in a 70-year-old woman with chronic atrial fibrillation. She was prescribed anticoagulant therapy with warfarin before elective cardiac surgery and demonstrated no thromboembolic event during a 2.5-month period. Preoperative transesophageal echocardiography showed the disappearance of the intracardiac mass and the presence of a left atrial septal pouch, suggesting that the initial image was a thrombus originating from the left atrial septal pouch.
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