Conclusion: MRI to diagnosis between the skull base source benign tumor and lump kind pathological changes value having certainly, can proceed the accurate fixed position diagnosis particularly.

结论：MRI对颅底骨源性良性肿瘤及瘤样病变的诊断具有一定的价值，尤其能够进行精确的定位诊断。

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MRI is more sensitive than ct in detecting the skull base encroachment. MRI could reveal the early infiltration of the bone marrow and tumor infiltration along the mandibular nerve.

MRI较CT对颅底骨质破坏的检出更敏感，MRI可以发现肿瘤沿三叉神经向颅内侵犯，而卵圆孔没有骨质破坏。

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CONCLUSIONS: MRI is more sensitive than ct in detecting skull base bone destruction and retropharyngeal lymph node involvement of NPC.

结论：MRI对鼻咽癌颅底骨质破坏和咽后淋巴结的检出率高于CT。

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