A closed interatrial septal aneurysm filled with blood can mimic a right atrial tumor or thrombus on echocardiography.
Right atrial masses on echocardiography may represent closed septal aneurysms; leaves open whether multimodality imaging prevents misdiagnosis.
We report the case of a 70-year-old woman with rheumatic mitral stenosis and a transient ischaemic attack. Transoesophageal echocardiography revealed a cystic mass in the right atrium, hanging to the interatrial septum by a pedicle, not circulating. The mass was heterogeneous and suggested a tumour (myxoma) or a thrombus. Surgical resection showed it was an interatrial septal aneurysm, closed on itself, filled with blood. The usual causes of cardiac tumours and pathogeny of large interatrial aneurysms are discussed.
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Isabelle Ginon (2000) studied this question.
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