A peculiar case of mobile right atrial mass thrombotic in origin identified by two-dimensional echocardiography is reported. By the characteristics of the mass and the negative history for SBE and malignant neoplasm, the possibilities of tricuspid vegetations or infiltration by an extracardiac tumor could be reasonably ruled out. On the other hand, a myxomatous mass could not be excluded in this case. The thrombotic nature of the mass was recognized at autopsy. The possibility to identify by two-dimensional echocardiography right atrial masses together with the difficulties in certain particular cases to recognize their nature are discussed.
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