成熟囊胞性奇形腫と鑑別を要した縦隔血管腫の1例

Mediastinal Hemangioma Mimicking a Mature Cystic Teratoma；Report of a Case

縦隔血管腫は比較的まれな疾患である．また画像的特徴に乏しく，術前に診断されることは少ない．われわれは，術前画像診断から成熟囊胞性奇形腫との鑑別を要した縦隔血管腫の1例を経験したため，考察を交え報告する．

A 16-year old young man was referred to our hospital due to abnormal mass of mediastinum on chest radiography. Chest computed tomography scan revealed 45 mm mass in diameter with low density areas and ring shaped calcification at right upper mediastinum. However, chest magnetic resonance imaging showed no existence of fat nor calcification. Although no typical findings was observed, surgical resection was performed because mature cystic teratoma was undeniable. At complete video-assisted thoracoscopic surgery, tumor was found to be in the upper mediastinum covered with mediastinal pleura and with dense fibrous structures around it, and was resected with surrounding fat tissue. Histological diagnosis was hemangioma associated with lymphangiogenesis and arteriovenous malformation-like region in the surrounding fat tissue.