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目的提高对第三脑室胶样囊肿的CT及MRI表现的认识。方法回顾分析经手术病理证实的5例第三脑室胶样囊肿的CT及MRI表现,并结合有关文献进行分析。结果5例第三脑室胶样囊肿位于第三脑室前上部与侧脑室孟氏孔相邻,CT表现为高密度4例,低密度1例;MRI上T1WI呈高信号1例,等信号4例,T2WI低信号1例,等信号3例,混杂信号1例。病灶圆形或椭圆形边缘清晰,增强后无强化,周围脑实质无水肿。3例出现两侧脑室不同程度脑积水,1例病灶边缘可见小片状钙化。结论第三脑室胶样囊肿发病部位特殊,CT及MRI是诊断第三脑室胶样囊肿的最重要的检查方法。
Objective To improve the understanding of CT and MRI findings of the third ventricle colloid cyst. Methods The CT and MRI findings of 5 cases of third ventricle cyst confirmed by surgery and pathology were retrospectively analyzed and analyzed with relevant literatures. Results 5 cases of third ventricle colloid cyst located in the front of the third ventricle and Monteggia adjacent to the lateral ventricle, CT showed high density in 4 cases, 1 case of low density; MRI T1WI was high signal in 1 case, 4 cases of equal signal, T2WI 1 case of low signal, 3 cases of equal signal and 1 case of mixed signal. Circular lesions or oval edges clear, no enhancement after enhancement, surrounding brain parenchyma without edema. Three cases showed different degrees of hydrocephalus on both sides of the cerebral ventricle, and 1 case showed small calcification on the edge of the lesion. Conclusion The location of the third ventricle plastic cyst is very special. CT and MRI are the most important methods to diagnose the third ventricle colloid cyst.