原発臓器が異なる両側転移性肺腫瘍

Bilateral Metastatic Lung Tumor with Different Primary Organs

癌治療の進歩により癌患者の長期予後が期待できるようになり，重複癌例を経験することが増えてきた．われわれは重複癌で左右に1個ずつの肺腫瘍を認め，左右別々の原発巣からの転移であった症例を経験したので報告する．

A 72-year-old woman with a history of surgery for left breast cancer was found to have sigmoid colon cancer and solitary pulmonary tumor of left upper lobe. We diagnosed adenocarcinoma of the unknown origin by a transbronchial biopsy. We performed left upper segmentectomy and sigmoidectomy. Left pulmonary tumor was diagnosed metastatic lung tumor from breast cancer. A right pulmonary tumor was confirmed by chest computed tomography （CT） after sigmoidectomy. It was also considered to be metastasis from breast cancer and treated with vinorelbine ditartrate. Since no effect was observed by chemotherapy, tumor was surgically removed by wedge resection. Right pulmonary tumor was pathologically diagnosed as metastasis from sigmoid colon cancer. In suspicious case of pulmonary metastases from double cancer, the possibility of different lesions from different primary site should be kept in mind.