<正>Despite the considerable mortality and morbidity in metastasis cardiac mass

antemortem diagnosis is unusual.Here we report a case of a left atrial mass echocardiographically mimicking myxoma

in a patient with lung carcinoma.The mass was pathologically confirmed to be metastatic carcinoma

which had entered the left atrium via direct invasion of left superior pulmonary vein

illustrating the potential for unusual routes of tumor spread into the heart and the importance of obtaining a tissue diagnosis in such cases.