前頭骨に発生した骨内脂肪腫の1例

A Case of Intraosseous Lipoma in the Frontal Bone

Ⅰ．はじめに

　正常骨の骨髄には脂肪組織が豊富に存在しているが，骨内に脂肪腫が発生することは稀である．骨内脂肪腫はどの部位の骨にも発生し得るが，大腿骨近位部や踵骨など四肢の骨に発生することが多く，頭蓋骨では少ない⁹⁾．頭蓋骨内脂肪腫はこれまで17例報告されているに過ぎない^{1-5,8,9,11-15,17-19)}．今回われわれは，10歳代後半に発生し，40年以上の経過をもつ前頭骨内脂肪腫の1例を経験したので，文献例を交えて考察する．

　A case of intraosseous lipoma in the frontal bone was reported. A 62-year-old woman had a hard tumor affecting the right frontal bone. The slowly growing tumor was first noticed when she was in her late teens. The completely excised right frontal lesion was composed of mature adipose tissue with abundant fibrous stroma. Intraosseous lipoma affecting the skull is extremely rare,with only 17 cases having been reported previously. Presurgical diagnosis of intraosseous lipoma of the skull is difficult because of its non-specific radiological features. Pathological study is indispensable for a correct diagnosis.