Key result
Right hemidiaphragmatic eventration can mimic an intracardiac mass on TTE by compressing the RA.
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Highlights the importance of careful echocardiographic interpretation and clinical correlation to distinguish extracardiac pseudo-masses, such as diaphragmatic eventration, from true intracardiac masses.
Interesting extracardiac findings can incidentally be found on transthoracic echocardiography such as a right hemidiaphragmatic eventration which can rarely be seen compressing the right atrium. Careful echocardiographic interpretation combined with clinical correlation is essential to distinguish extracardiac pseudo‐masses mimicking true intracardiac masses.
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Chebabi et al. (2026) studied this question. Right hemidiaphragmatic eventration can present on transthoracic echocardiography as an extracardiac pseudo-mass compressing the right atrium and mimicking a true intracardiac mass.
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