[Pulmonary Enteric Adenocarcinoma;Report of a Case].

: A 73-year-old man was referred to our hospital because of an abnormal shadow on a chest radiography. Chest computed tomography(CT) revealed a 3 cm nodule in the right lower lung lobe, fluorodeoxyglucose-positron emission tomography (FDG-PET) showed abnormal uptake in the tumor with a maximal standardized uptake value (SUV) max of 5.8. Bronchoscopy revealed adenocarcinoma cells. A right lower lobectomy and upper lobe partial resection and ND2a-1 were performed. Histological analysis revealed lung cancer comprising tall columnar cells. Immunohistochemical staining was positive in CDX2, CK20 and CK7. Any primary tumor was not found by postoperative screening. We diagnosed as a pulmonary enteric adenocarcinoma. After 6 months from operation, multiple recurrence was found and the patient died 8 months after operation.