[A case of true pulmonary carcinosarcoma].

The patient was a 47-year-old man who had visited a nearby physician with a chief complaint of bloody sputum. This patient underwent partial resection of the left upper lobe including a tumor adjacent to a huge bulla revealed by a plain chest radiograph. The resected tumor was composed of adenocarcinomatous and sarcomatous components, including partially-differentiated chondrosarcoma and rhabdomyosarcoma. The diagnosis was therefore true pulmonary carcinosarcoma. The sarcoma component recurred in the remaining part of the left lung. This recurrent lesion was surgically unresectable, but was regionally controlled with radiotherapy and bronchial arterial infusion of anticancer agents. However, distant metastases occurred to the brain, liver, and small intestine, and digestive tract bleeding also occurred. Nevertheless, chemotherapy, linac radiosurgery, percutaneous radiofrequency ablation, and partial small intestinal resection combined with rectal resection were performed. At autopsy, a metastatic lesion was also detected in the pancreas. Liver metastatic lesions were determined to be the adenocarcinomatous component, and the other recurrent or metastatic lesions, except for those in the brain, were all composed of poorly-differentiated sarcomatous tissue.