颅底骨源性肿瘤的CT、MRI影像诊断

目的：分析颅底骨源性肿瘤的 Ｃ Ｔ 、 Ｍ Ｒ Ｉ 表现并与病理对照，探讨 Ｃ Ｔ 和 Ｍ Ｒ Ｉ 对该类疾病的诊断价值与限度。方法： 收集了经手术和病理证实的颅底骨源性肿瘤２３ 例（ 软骨肉瘤５ 例、软骨瘤２ 例、转移瘤３ 例、脊索瘤８ 例、骨巨细胞瘤２ 例、动脉瘤样骨囊肿１ 例、骨化性纤维瘤２ 例） ，全部病例均行 Ｃ Ｔ 和 Ｍ Ｒ Ｉ 检查（ 其中１１ 例行增强 Ｍ Ｒ Ｉ 检查，７ 例行增强 Ｃ Ｔ 检查） 。结果：大部分肿瘤边界清晰， Ｍ Ｒ Ｉ Ｔ１ Ｗ Ｉ 呈低或等信号， Ｔ２ Ｗ Ｉ 呈不均匀高信号，且 Ｔ１ Ｗ Ｉ 低信号区在 Ｔ２ Ｗ Ｉ 上随回波时间延长信号仍呈低信号而提示钙化。 Ｃ Ｔ 上显示不同程度骨质破坏及钙化。 Ｍ Ｒ Ｉ 显示斜坡、岩骨破坏较敏感。结论： Ｃ Ｔ 能准确显示骨质破坏情况及钙化程度， Ｍ Ｒ Ｉ 在显示病变的范围方面要优于 Ｃ Ｔ ，两者相结合是诊断颅底骨源性肿瘤的最佳影像学检查方法。

Bone Tumours of Skull Base:CT and MRI Features

Objective:To analyse the CT and MRI features of bone tumours in cranial base with comparison of pathology,and to evaluate the value of MRI and CT in diagnosis.Methods:23 cases of bone tumours of the skull base including chondrosarcoma(n=5),chondroma(n=2),metastases(n=3),chordoma(n=8),giant cell tumour(n=2),anurysmal bone cyst(n=1) and ossifying fibroma(n=2) proven suigically and pathologically were analyzed retrospectively. CT and MRI(11 cases with post-contrast MRI and 7 cases with post-contrast CT scans) were performed in all cases.Results:Most of the tumours were welldefined,T1W images showed low or intermedia signal intensities.T2W images showed inhomogeneous high signal intensities.The low signal on T1WI was still low signal intensity on T2WI which suggested calcification.MRI was sensitive in demonstrating the destruction of the clivus and petrous bone.Conclusion:CT can clearly show bone destruction and calcification.MRI is superior to CT in demonstrating the outline of the tumours.CT and MRI were effective methods in the diagnosis of the sorts of diseases.