Neurological Surgery 脳神経外科34巻9号

2006年09月発行

総説

脳・血管周囲腔と新しい病態―高磁場MR機による占拠性病変の観察から―

著者： 佐伯直勝¹ 村井尚之¹ 岩立康男¹ 永井雄一郎² 角南兼朗³

所属機関： ¹千葉大学大学院医学研究院脳神経外科学 ²千葉大学大学院医学研究院病態病理学 ³JFE 川鉄千葉病院脳神経外科

ページ範囲：P.885 - P.898

Ⅰ．従来の血管周囲腔の画像とその意義

　高磁場のMR機器が広く普及し，人・生体における微細な構造が観察可能になった．それにつれ，血管周囲腔に関与したMR像が数多く報告されるようになった．1990年代から血管周囲腔は，MR上の分布と画像所見に類似点があることから，大脳基底核や前交連付近のラクナ梗塞との鑑別疾患としてクローズアップされた．また，大脳白質（centrum semiovale）においては，境界不鮮明な地図状，斑状の白質病変であるleukoaraiosisとの鑑別が問題となっている^{2,3,5,8,11,15)}．

　血管周囲腔は，MR上脳実質内での拡大した部分が観察され，画像上，脳表から多少離れた脳実質内の脳脊髄液信号域として観察される．血管周囲腔は以下の5つの条件を満たした際，それと診断される．

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