肺原発胎児型腺癌

Fetal Adenocarcinoma of the Lung

肺癌取扱い規約第8版によれば，胎児型腺癌は胎児肺に類似した成分により構成される腫瘍で1），まれな腫瘍とされている．全肺癌の約0.1％との報告もみられる2）．胎児型腺癌切除の1例を経験したので，文献的考察を加えて報告する．

We report a resected case of fetal adenocarcinoma. Fetal adenocarcinoma is a rare type of malignant lung tumor. A 53-year-old man had a 25 mm tumor in the right upper lobe on chest computed tomography. On fluorodeoxyglucose-positron emission tomography （FDG-PET）, the tumor showed the accumulation of FDG with a standardized uptake value （SUV） max of 5.63. He underwent bronchoscopic examination, but a diagnosis was not established. We suspected that the tumor was primary lung cancer or metastatic lung tumor of rectal cancer which was resected prior to the treatment for pulmonary lesion. A right upper lobectomy with lymph node dissection was performed and the pathological diagnosis was high-grade fetal adenocarcinoma, stage IB （pT2aN0M0）. The patient was treated with postoperative adjuvant chemotherapy. There has been no recurrence after surgery resection for 9 months.