[Right atrial myxoma in a patient with antiphospholipid antibodies]. / Mixoma auricular derecho en paciente con anticuerpos antifosfolipídicos positivos.

A 28 year-old asymptomatic male with previously detected elevation of antiphospholipid antibodies (aPL) had a right atrial mass diagnosed by transthoracic echocardiography. Although the morphological characteristics were highly suggestive of myxoma, due to the presence of aPL elevation it had to be differentiated from atrial thrombus. The patient underwent surgery and a 3 x 4 cm mass with its large base attached to the interatrial septum was removed. Histopathological examination confirmed that it was a myxoma. On follow-up, the patient was asymptomatic and antiphospholipid antibodies became undetectable.