Abstract
In a 67-year-old woman, mastectomy was performed for breast cancer, and the follow up study is currently proceeding. The serum CEA level gradually elevated. Chest X-ray and CT examination revealed a tumorous lesion. Although the histology of TBLB and cytological material showed no malignancy, the serum CEA level was elevated (40.6ng/ml). Therefore, it seemed impossible to neglect the possibility of lung cancer and a right lower lobectomy was performed. The dissected specimen was diagnosed as organized pneumonia showing squamous metaplasia. Immunohistochemical staining for CEA was positive at the region of metaplasia. The postoperative serum CEA level was reduced (8.9ng/ml). The elevated serum CEA level made it difficult to diagnose this case.
