Related Experiment Video
Updated: May 25, 2026

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
Published on: June 11, 2019
Atypical size and location of a right atrial myxoma: a case report
Vinícius Js Nina1, Nathalia Ac Silva, Shirlyne Fd Gaspar
1University Hospital of the Federal University of Maranhão, Rua Barão de Itapary, 227 Centro 65020-070, São Luis Maranhão, Brazil. rvnina@terra.com.br.
Introduction:
Primary intracardiac tumors are rare and approximately 50% are myxomas. The majority of myxomas are located in the left atrium and have variable clinical presentation. We report a case of a large myxoma in the right atrium, which is an uncommon location for this type of tumor.
Case Presentation:
A 45-year-old Caucasian woman with a history of palpitation had dyspnea on great exertion and discrete weight loss. A cardiac evaluation showed splitting of S1. An echocardiogram showed a large mass in the right atrium, suggesting myxoma; chest computed tomography confirmed the diagnostic hypothesis. Our patient underwent surgical treatment with excision of a 10 cm multilobulated mass. She presented with supraventricular tachycardia during the operation. She was placed in the intensive care unit and her condition improved after the use of amiodarone. The diagnosis of myxoma was confirmed by histopathological study.
Conclusions:
In this case report, we emphasize the rarity of large myxomas in the right atrium and the difficulty of differential diagnosis given their dimension and location.
Related Concept Videos
Mitral Stenosis II: Clinical features and Diagnostic Tests
Mitral Stenosis I: Introduction
Cardiomyopathy III: Hypertrophic Cardiomyopathy
Cardiomyopathy IV: Restrictive Cardiomyopathy
Aortic Regurgitation II: Clinical Features and Diagnostic Tests
