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分析１１４例经手术病理或脑血管造影证实的ＣＰＡ占位性病变的ＣＴ表现。ＣＰＡ脑外病变的定位征象有脑组织受压移位，患侧桥池和／或环池增宽，宽基底与岩骨相贴，岩骨侵蚀破坏，肿瘤轮廓清晰，瘤周水肿少见且程度轻。脑内病变延伸至ＣＰＡ表现为病变大部分位于一侧小脑半球或脑干，向患侧ＣＰＡ延伸，患侧桥池和／或环池受压变窄或闭塞。患侧桥池和／或环池增宽与否是鉴别ＣＰＡ病变来自脑外或脑内的重要征象。
The CT findings of 114 lesions of CPA confirmed by surgical pathology or cerebral angiography were analyzed. The signs of extracranial lesions in CPA include pressure displacement of brain tissue, broadening of bridging pool and / or peri-annular pool on the affected side, wide basement and bone plating, erosion and destruction of petrous bone, clear outline of tumor, rare and mild peritumoral edema . Extending cerebral lesions to CPA showed lesions mostly located in one side of the cerebellar hemisphere or brain stem, extended to the affected side of the CPA, ipsilateral bridge and / or cistern pressure narrowing or occlusion. Broadening of the ipsilateral bridging pool and / or ring pool is an important sign to identify whether the CPA lesion comes from outside the brain or into the brain.