颅底脊索瘤的MR表现分析及鉴别诊断

目的：分析颅底部脊索瘤的MR平扫及增强的影像学表现，探讨MR在颅底脊索瘤的诊断和鉴别诊断价值。方法：回顾性分析经临床病理证实的16例颅底脊索瘤的MRI表现。结果：16例颅底脊索瘤中，肿瘤局限于斜坡者9例，累及鞍内、鞍旁、蝶窦、鼻咽部者7例，同时累及后颅凹者1例。病变在T1WI呈不均匀长?蛐等T1信号软组织肿块影，T2WI 9例呈等或稍长T2信号，7例呈明显长T2信号。增强扫描10例呈不均匀强化，6例呈明显强化。5例术后复查肿瘤复发。结论：MR可明确显示颅底脊索瘤的位置、形态、浸润范围及与周围组织的解剖关系，MRI表现有一定的特征性，对颅底脊索瘤的诊断和鉴别诊断有较大价值。

Analysis of MR manifestation and differential diagnosis in chordoma of the skull base

Objective:To analyse the MR manifestations in chordoma of the skull base,evaluate the value of diagnosis and differential diagnosis with MRI in basicranial chordoma.Methods:MRI findings in 16 patients with pathologically-proved basicranial chordoma were analyzed retrospectively.Results:In 16 cases of chordomas,9 tumors located in clivus,7 tumors involved intrasellar,parasellar,sphenoidal sinus,and nasopharynx,1 involved posterior cranial fossa simultaneously.Tumors displayed inhomogenous hypo/isointense T1 signal soft tissue tumors,in T2WI 9 showed isointense or slightly long T2 signal,7 showed extremely long T2 signal.Contrast enhancement displayed 10 cases had inhomogenous enhancement and 5 cases had markedly enhancement.Conclusion:MRI can well display the location,shape,infiltrating scope of the basicranial chordoma and anatomic relationship with adjacent tissue,basicranial chordomas have certain specific MR features,MRI has higher value in diagnosis and differential diagnosis of basicranial chordoma.