[Synchronous double carcinoma of the left lung and esophagus; report of a case].

A 75-year-old man, who was followed for the atypical epithelium of the stomach, was diagnosed as esophageal carcinoma. Further examination revealed left lung tumor that was suspected of lung carcinoma. Radical operation of the esophageal carcinoma was performed. On 41st postoperative day, after open biopsy for the left lung tumor, left upper lobectomy was performed. Pathological diagnosis was moderately differentiated squamous cell carcinoma of the esophagus and well differentiated adenocarcinoma of the lung. Synchronous double carcinoma of the lung and the esophagus is rare.