不典型脑转移瘤的CT诊断

目的 分析脑转移瘤的CT特征，提高对不典型脑转移瘤的认识。方法 回顾性分析了214例脑转移瘤的CT资料。结果 脑转移瘤的典型CT表现是大脑皮层或皮层下（86.02%）多发的（73.83%）均匀结节（40.42%）或环形结节（32.53%），增强扫描后不同程度强化（98.80%),瘤周水肿明显。病灶也可见于基底节（2.65%）、小脑（8.67%）、室管膜下（1.45%）、丘脑（0.48%）和脑干（0.24%）。病灶也可呈直径超过3cm的均匀肿块（4.10%）或环形肿块（12.53%），也可呈单纯囊肿型（2.89%）、囊壁结节型（2.17%）或不规则多囊状（5.54%）。结论 不典型性脑转移瘤的CT诊断除了仔细观察病灶的影像细节外，积极寻找原发肿瘤显得格外重要。

CT diagnosis of atypical brain metastasis

Objective To analyse CT features of brain metastasis,thereby improving understanding of atypical brain metastasis.Methods CT data of 214 patients with brain metastasis were analysed retrospectively.Results Typical CT features of brain metastasis appeared as multiple (73.83%),homogeneous nodes (40.24%) or ringshaped nodes (32.53%) in cerebral cortex or infracortex (86.02%).Varied degrees of contrast cnhancement could be visualized (98.80%).Foci also existed at basal ganglion (2.65%),cerebellum(8.67%),lateral ventricular wall (1.45%),thalamus(0.48%) and brain stem (0.24%).The foci were in the shape of homogeneous mass (4.10%),ringlike mass (12.53%),simple cyst (2.89%),cyst with nodular wall(2.17%) or irregular multilocular cyst (5.54%).Conclusion CT diagnosis of atypical brain metastasis entails careful observation of imaging details and search for primary tumor.