Spindle cell component in pleomorphic carcinoma showing polypoid growth in the pulmonary vein.

We describe a rare case of a pleomorphic carcinoma forming polypoid growth in the pulmonary vein. A 69-year-old man was admitted with an abnormal shadow in his right lung. Thoracic computed tomography scans showed a polypoid lesion extending into the right lower pulmonary vein. We performed a right lower lobectomy without any evidence of tumor embolism perioperatively. Pathological examination revealed that the lesion was a pleomorphic carcinoma of the lung and that the polypoid lesion in the pulmonary vein was composed solely of spindle cell components. Early ligation of affected vessel is important to avoid tumor embolism through the pulmonary veins.