Spontaneous intramural atrial hematoma presenting as a left atrial mass

We describe an unusual case of spontaneously occurring intramural atrial he matoma with no communication with either atrium. The diagnosis of left atri al mass was made from transthoracic echocardiography. Subsequent examinatio n with trans-esophageal echocardiography confirmed a large mass essentially filling the whole left atrium but failed to provide an etiologic diagnosis , which was eventually made at surgery.