後縦隔に発生した血管脂肪腫の1例

Angiolipoma Arising in the Posterior Mediastinum：Report of a Case

はじめに　血管脂肪腫は脂肪腫の中で5〜17％を占める良性腫瘍である．病理組織学的には非浸潤型と浸潤型に分けられる．多くは非浸潤型であるが，浸潤型は再発例が報告されている．好発部位は上肢および体幹の皮下組織といわれているが，われわれは後縦隔に発生したまれな症例を経験したので報告する．

The patient was an 82-year-old man. A posterior mediastinal tumor was noted on chest computed tomography （CT）. Magnetic resonance imaging （MRI） scan showed a high signal on both T1- and T2-weighted imaging. Lipoma was suspected, but since the border with the vertebral body was partially unclear, video-assisted tumor resection was performed for diagnosis and treatment purposes. Finally, we diagnosed it as non-infiltrating angiolipoma. Angiolipoma is a benign tumor that accounts for 5-17％ of all lipomas. Pathologically, they can be divided into two types：infiltrating and non-infiltrating. Most are non-infiltrating, but recurrent cases of the infiltrating type have been reported. Angiolipoma commonly occurs in subcutaneous tissues of the upper extremity and trunk, but we report a rare case that occurred in the posterior mediastinum.