後頭骨巨大骨腫の1例

A Case of Giant Osteoma in The Occipital Bone

I．はじめに

　頭蓋骨骨腫は，日常臨床において比較的よくみられる良性頭部腫瘍であるが，小さなものが多く，そのまま放置されることが多い．

　今回，われわれは，後頭骨に発生し，小脳の圧迫が示唆された，比較的稀と思われる巨大な頭蓋骨骨腫の1例を経験したので，症例を呈示するとともに，若干の文献的考察を加え報告する．

A 51-year-old female patient, admitted with a chief complaint of dizziness, had bulging of the occipital area, which had started insidiously.

On admission, a bony hard swelling with a smooth surface was noted in the left occipital region, extending over the midline of the skull.

Plain X ray films revealed a uniform shadow of an osteoid mass inside the occipital bone. A tomogram in-dicated that the mass originated in the diploe or outer table of the skull, although there was no evidence of destruction of the inner table.