1. Objective To clarify the CT criteria for encephalitic stage and enveloped stage of brain abscess.
   目的明确脑脓肿脑炎期与包膜期CT分期标准。
2. Results The encephalitic stage was characterized by prominent perivascular cuffing.In enveloped stage, five distinct histological zones were seen.
   结果脑炎期以“血管周围套"为镜下特征，包膜期表现为5个独特的组织学区带。

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