微小髄膜細胞様結節を合併した若年者肺癌の1例

Lung Adenocarcinoma Combined with Minute Pulmonary Meningothelial-like Nodule （MPMN） in Young Patient；Report of a Case

はじめに　微小髄膜細胞様結節（MPMN）は，外科切除肺や剖検例で偶発的に認められることが多く，髄膜腫と類似した微小結節である1）．Mizutaniらの報告2）では，MPMNの発症年齢は平均62.3歳と比較的高齢者に多い．われわれは，若年でMPMNを合併した肺腺癌の1例を経験したので報告する．

We report a rare case of lung adenocarcinoma combined with minute pulmonary meningothelial-like nodule （MPMN） in a young adult. A 39-year-old woman was referred to our department for abnormal shadow of the right lower lobe. Chest computed tomography （CT） showed a mass shadow, 11 mm in size, in right S6. Since fluorodeoxyglucose-positron emission tomography （FDG-PET） demonstrated a lesion with FDG activity, with an increased uptake value of 2.2, this lesion was suspected to be a lung cancer. Wedge resection of right S6 was performed via thoracoscopy. The intraoperative pathological diagnosis was invasive lung adenocarcinoma, and additional right S6 segmentectomy and lymph node dissection （ND1a） was performed. The final pathological diagnosis of the tumor was adenocarcinoma of the lung, and MPMN was incidentally found by pathology in reseced specimen.