CT及MRI诊断异位脑膜瘤6例

CT and MRI diagnosis for six patients with ectopic meningioma

目的 探讨 CT及 MRI在鼻窦、中耳异位脑膜瘤术前的诊断价值 .方法 我科 1981/ 2 0 0 1年收治鼻窦脑膜瘤 5例 ,中耳脑膜瘤 1例 ,进行临床资料回顾性分析 .结果 5例鼻窦脑膜瘤术前 CT和 /或 X线检查均为鼻窦内高密度或低密度影 ,窦腔呈膨胀性改变 ,经术后病理确诊 . 1例中耳脑膜瘤 CT显示硬化型乳突 ,不除外胆脂瘤 ,术后 2次行颅脑 CT扫描未见异常 ,MRI检查见小脑角占位病变 ,包绕颈内动、静脉 ,侵犯岩尖、海绵窦、中耳 ,下达颈部 ,经开颅手术证实 ,确诊为颅颈交通性脑膜瘤 .结论 CT诊断脑膜瘤的优势是可明确显示钙化 ,可直接显示肿瘤引起的骨质破坏范围 ;MRI对软组织有很好的分辨率 ,可多方位显示病变及其与周围组织结构的解剖关系 .确诊最终依靠病理检查 .

AIM To investigate the value of CT and MRI in the diagnosis of paranasal and middle ear ectopic meningioma. METHODS The clinical data of paranasal ( n =5) and middle ear ( n =1) meningioma were retrospectively studied. RESULTS Preoperational CT and/or X ray images of5 cases of paranasal meningioma showed both high and low density shadow in the paranasal cavity and the cavity was expanded. Preoperational CT of one case with middle ear meningioma showed constrictive type mastoid and had signs of cholesteatoma. Postoperative MRI images showed brain tumor in the pontocerebellar angle and had invaded the middle ear and neck. Cranial operation confirmed a cranial neck communicative meningioma. CONCLUSION CT images directly show calcification and the range of bony destruction by the tumor. MRI images show multi direction of the tumor and its relationship with the surrounded tissues.