乳癌術後28年目に肺転移および縦隔リンパ節転移と診断された1例

Metastases in the Lung and Mediastinal Lymph Nodes from Breast Cancer 28 Years after the First Operation：Report of a Case

はじめに　乳癌は原発巣術後から比較的遠隔期にも再発・転移を認め，10年目以降の再発例もたびたび報告されており1），その場合は原発性肺癌との鑑別が困難である2）．われわれは，乳癌術後28年目に診断された肺転移，縦隔リンパ節転移の1手術例を経験したので報告する．

A 76-year-old woman was pointed out a small nodule in the right lower lung lobe on a chest computed tomography （CT） for follow-up examinations of malignant thyroid lymphoma. Although she had undergone a radical mastectomy for right breast cancer 28 years previously, the nodule was suspected to be either metastatic lymphoma or primary lung cancer and thoracoscopic surgery was planned to perform. Since the intraoperative frozen section diagnosis was adenocarcinoma, right lower lobectomy and systemic lymph node dissection were performed. However, the final pathology revealed that the lesion was breast cancer metastasis and subcarinal lymph nodes were also positive for metastases.