20例小脑转移瘤的MRI分析

MRI Findings of 20 cases with Cerebella Metastases

目的探讨小脑转移瘤的MR I表现。资料与方法回顾性分析20例小脑转移瘤,其原发灶均经纤维支气管镜活检或手术活检病理证实,对其MR I表现特征进行总结分析。结果20例患者中仅累及小脑者8例(40%),合并大脑或脑干转移者12例(60%);共计发现42个病灶,其中位于左侧小脑半球14个,右侧小脑半球17个,小脑蚓部11个。病变周围伴轻度水肿15个(35.7%);中度水肿5个(11.9%);重度水肿13个(31.0%);无水肿9个(21.4%)。增强扫描后,病灶呈实性结节或球形强化者23个;环状强化者12个;线团状强化者5个;片状强化者2个。结论小脑转移瘤的MR I表现具有一定特征性,MR I对小脑转移瘤的诊断及鉴别诊断具有重要价值。

Objective To evaluate MRI findings of cerebella metastases. Materials and Methods MRI features of 20 patients suffering from cerebella metastases were analyzed retrospectively. The primary tumors had been confirmed by fiber optic bronchoscope biopsy or surgical biopsy. Results Metastases tumors involved cerebella alone in eight cases （40%）, and involved cerebella combined with hemicerebrum or brain stem in 12 cases（ 60% ）. A total of 42 lesions were found, 14 lesions located in the left cerebella hemisphere, 17 lesions located in the right cerebella hemisphere, 11 lesions located in the cerebella vermis. 15 cases had mild edema around the lesions,5 cases had moderate edema, 13 had severe edema,and 9 cases without edema . After contrast enhanced,23 lesions showed solid nodule or spherical enhancement, 12 were ring-like enhancement,5 were coil-like enhancement,2 were sheet enhancement. Conclusion Cerebella metastases had certain MRI features. MR1 could be useful in the diagnosis and differential diagnosis of cerebella metastases.