頭蓋内骨軟骨腫の1例—特にそのMRI像について

A Case of Intracranial Osteochondroma: Its MR images

I．はじめに

　頭蓋内骨軟骨腫（osteochondroma）は全頭蓋内腫瘍の0.1％以下を占めるとされる極めて稀な脳腫瘍である^{10，11,13）}．これまでにそのCT像についての報告はあるが^{2,4,5,7,8,12,13）}，MRI像については報告されていないようである．われわれは，頭蓋底から発生した骨軟骨腫の1例を経験し，CT,MRIにて検索する機会を得たので報告する．

A 15-year-old boy was referred to our department due to left abducens palsy and trigeminal neuralgia. CT scans that had been taken fourteen months before this referral failed to disclose any abnormality. CT scans taken on admission, however, demonstrated an irregu-lar calcified lesion in the left parasellar region. This im-plied that some ossifying process had been progressing during these fourteen months.

MR images clearly demonstrated tumor contour and it was shown that high and low intensity spots were evenly scattered within the tumor.