颅内脊索瘤与鼻咽癌的MRI诊断及鉴别诊断

目的探讨颅内脊索瘤和鼻咽癌的MRI诊断及鉴别诊断,评价MRI诊断价值。方法回顾性分析经病理证实的8例脊索瘤、23例鼻咽癌的MRI表现。结果7例脊索瘤中心部位在颅底中线处的斜坡/鞍区,肿瘤以颅底为主,主要向颅内蔓延,广泛破坏枕骨斜坡或蝶骨体,呈边界清楚、范围较大的骨质缺损;与鼻咽部生长为主再向颅内侵犯的鼻咽癌不同。颅内脊索瘤和鼻咽癌因血供不同,强化亦有较明显区别。结论MRI是诊断颅内脊索瘤和鼻咽癌的很有效的检查方法,具有重要的诊断和鉴别诊断价值。

MRI Diagnosis and Differential Diagnosis of Intracranial Chordoma and Nasopharyngeal Carcinoma

Objective To evaluate the value of MRI in the diagnosis of intracranial chordoma and nasopharyngeal carcinoma.Methods MRI findings of 8 chordomas and 23 nasopharyngeal carcinomas confirmed pathologyically were retrospectively analysed.Results The central position of chordomas in 7 cases was located in the midle pant of the clivus/the saddle aera of the base of the cranium,the tumor wasmainly in base of cranium and extends encephalicly,the occipital clivus and sphenoid body were destroied widly with sharp borderline.Chordoma was obvious differential from carcinoma,the later was primary growth in the nasopharynx and then spreaded to encephalic.Theblood supply intracranial chordoma and carcinoma is difference,so that they were obvious differential on contrast-enhanced scan.Conclusion MRI is a effective method in diagnosis of intracranial chordoma and nasopharyngeal carcinoma and have important value in diagnosis anddistinguish diagnosis.