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Ⅰ.はじめに
放射性同位元素による頭蓋内腫瘍病変の診断は近年の医療機器や新しいアイソトープの開発と共に,脳神経外科領域への応用価値は著しく向上してきた.しかし一般的には後頭蓋窩腫瘍に限った診断成績はテント上のものに比べて低いという悲観的見解も多いが,種々の工夫を加えることにより診断価値を向上させることができると考えられる.
われわれは,後頭蓋窩腫瘍25例に,合計48回の脳スキャンを施行し,それに種々の工夫を加えて診断率の向上をはかったので,その結果を報告し,あわせて若干の考察を行なった.
It has been generally accepted that the scanning of the posterior fossa yieled less accuracy in comparison with that of the supratentorial region. It seems that the difficulties are primarily attributable to the parotid gland, the overlying venous sinuses, and the heavy investment of the muscles with their rich vacsular soppy at the posterior fossa. These problems are compounded by poor patient positioning in the posterior view. We believe that the brain scanning of the posterior lossa is, however, nearly as successful as that of the supratentorial region, when the following procedures are carried out.
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