経時的に増大を認めた前縦隔の類皮囊腫の1例

Anterior Mediastinal Dermoid Cyst with Enlarging Tendency：Report of a Case

はじめに　類皮囊腫は眼，鼻の周囲，耳後部，口腔底などの顔面領域に好発する囊胞腔内に層状，鱗片状，羽毛状の角質物が充満する良性腫瘍であり，縦隔発生はまれである．われわれは縦隔に発生した類皮囊腫の1例を経験したため，文献的考察を加えて報告する．

A 36-year-old woman referred to our hospital for treatment of a mediastinal tumor. Contrast computed tomography （CT） scan was revealed a 31×21×25 mm mass in the anterior mediastinum, with low contrast, clear border, and a tendency to increase. On magnetic resonance imaging （MRI） examination, the anterior mediastinal tumor showed homogeneous high signal intensity on T1-weighted images and a combination of high and low signal intensities on T2-weighted images. A benign tumor was suspected, and surgery was performed for diagnostic and therapy. Histopathology did not demonstrate malignant cells and we diagnosed the tumor as dermoid cyst. The postoperative course was uneventful and the patient was discharged on 2nd postoperative day.