ロボット支援下手術で摘出した後縦隔Müller管囊胞の1例

Müllerian Cyst in the Posterior Mediastinum Resected by Robot-assisted Thoracic Surgery：Report of a Case

はじめに　Müller管は女性器に分化する組織で，この遺残組織が囊胞化したものがMüller管囊胞であり，まれな囊胞性良性腫瘍である1）．われわれは，後縦隔に発生したMüller管囊胞をロボット支援下手術（RATS）で摘出した症例を経験したので，報告する．

Müllerian cyst in the posterior mediastinum is a rare disorder. We report on the case of a woman in her 40s with a cystic nodule which is located in the right posterior mediastinum next to the vertebra at the level of tracheal bifurcation. The tumor was suggested to be cystic by preoperative magnetic resonance imaging （MRI）. The tumor was resected with robot-assisted thoracic surgery. Pathology by hematoxylin-and-eosin （H&E） revealed a thin-walled cyst lined by ciliated epithelium without cellular atypia. The diagnosis of Müllerian cyst was confirmed by immunohistochemical staining which showed the positive findings for estrogen receptor （ER） and progesterone receptor of the lining cells.