[A case report of well differentiated fetal adenocarcinoma].

A 32-year-old female, who was admitted with complaints of cough and an abnormal shadow in the left lower lobe, was diagnosed as adenocarcinoma of the lung by TBLB. She underwent left lower lobectomy and lymph node dissection. Histopathological findings showed well differentiated fetal adenocarcinoma (WDFA). Well differentiated fetal adenocarcinomas are considered to have a histogenesis similar to that of pulmonary blastoma and may be a tumor with one-sided development of pulmonary blastoma showing only an epithelial component.