増大傾向を呈し原発性肺癌との鑑別が困難であった扁平上皮腺上皮混合型乳頭腫の1例

Growing Mixed Squamous Cell and Glandular Papilloma Difficult to Differentiate from Primary Lung Cancer：Report of a Case

はじめに　扁平上皮腺上皮混合型乳頭腫（mixed squamous cell and glandular papilloma：MSGP）は非常にまれな肺良性腫瘍であり，本邦では現在まで約20例が報告されている1）．われわれは，増大傾向を呈し，術中迅速病理でも肺癌の診断であったものの，最終的にMSGPと診断された1例を経験したので報告する．

A 76-year-old woman was referred to our hospital due to abnormal chest radiography findings. Chest computed tomography （CT） revealed a nodule in the right lower lobe. Fluorodeoxyglucose-positron emission tomography （FDG-PET） showed abnormal accumulation in the nodule. Bronchoscopy did not provide a definitive diagnosis. Since the nodule tended to increase in size, primary lung cancer was suspected and surgery was performed. During the surgery, pathological diagnosis of squamous cell carcinoma was made, and a right lower lobectomy was performed. Subsequently, a pathological diagnosis of mixed squamous cell and glandular papilloma （mixed papilloma） was made. She has had no sign of recurrence for approximately four years since the surgery.