[A rare case of left atrial thrombus after left upper pulmonary lobectomy].

A 75-year-old man was operated for left atrial thrombus. He had received left upper pulmonary lobectomy for epidermoid carcinoma of the lung, 6 months previously. Thrombus, 5.2 X 1.5 X 0.8 cm in size, was grown up from the inside of the left upper pulmonary vein into the left atrial cavity. It was removed and left upper pulmonary vein orifice was sutured and closed. There was no abnormal findings in the endocardium of the left atrium and mitral valve. A case of the left atrial thrombus after the pulmonary lobectomy is very rare and this may be the first report in world literature.