しかしながら今回の検討では症例数が少なく危険因子の検討は十分ではない。危険因子の検討は、頭蓋内外動脈病変の進行の機序の違いを明らかにし、更に無症候性脳梗塞の出現のリスクも軽減することができる可能性もあり、今後も症例数を増やし検討していく予定である。
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