A Primary Adenosquamous Carcinoma of the Lung with a Rare Contralateral Metastatic Pattern.

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We report a rare case of adenosquamous carcinoma of the lung, in which the adenocarcinoma and squamous cell carcinoma component metastasized to the opposite lung independently of each other. In 75-year-old-man who was followed up after resection for colon cancer an abnormal shadow was pointed out on chest X-ray film. Chest CT showed an irregularlyshaped nodule in left S3, and two distinct nodules in S10 and S5. There was no other evidence of recurrence or metastasis. At first, video assisted thoracoscopical partial resection of the two nodules in the right lung was performed. The resected specimen from the right S5 revealed adenocarcinoma and that from S 10 was squamous cell carcinoma. Secondly, left upper lobectomy was performed, and the tumor was pathologically diagnosed as adenosquamous carcinoma. Metastasis of the adenocarcinoma component was noted in the mediastinal and hilar lymph nodes. The adenocarcinoma and squamous cell carcinoma of the right lung were histologically similar to the adenocarcinoma and squamous cell carcinoma component of the adenosquamous carcinoma, respectively, and they were considered to be metastases of the adenosquamous carcinoma.
特定非営利活動法人日本肺癌学会の論文