脉络丛乳头状瘤的MR、CT诊断

MR and CT diagnosis of choroid plexus papillomas

目的：分析脉络丛乳头状瘤的ＭＲＩ和ＣＴ表现。材料与方法：搜集经手术病理证实的脉络丛乳头状瘤２０例。全部病例均行ＭＲ或ＣＴ扫描。结果：脉络丛乳头状瘤在影像学检查中最大特点是肿瘤的位置和形态，肿瘤多位于扩大的脑室内，边缘凹凸不平，呈颗粒状。脉络丛乳头状瘤在ＭＲＴ１ＷＩ为等或稍高信号，Ｔ２ＷＩ为高信号。ＣＴ扫描为等或稍高密度影。ＭＲ和ＣＴ增强扫描可见均匀明显强化。结论：ＭＲ和ＣＴ检查对术前诊断脉络丛乳头状瘤很有帮助，并可清楚地显示肿瘤及其与周围组织的关系。ＭＲ扫描对脉络丛乳头状瘤的显示远远优于ＣＴ。

Purpose: To find out MR and CT features of choroid plexus papillomas. Materials and methods:20 histologically proven choroid plexus papillomas were studied. Results: Tumors were usually located in ventricles with granusly margin. On MR images, there were iso or slightly hypointensity on T 1 weighted images, hyperintensity on T 2 weighted images. On unenhanced CT scan, there was iso or slight hyperdense. The tymor exhibited strong homogenousl enhancement on enhanced CT and MR images. Conclusion: MR and CT are very helpful in diagnosing choroid plexus papillomas.