摘要
目的探讨颅骨表皮样囊肿(SEC)的CT和MRI影像学特点,以提高对该病的认识。资料与方法回顾性分析10例经手术病理确诊的SEC的CT及MRI表现。9例行CT平扫;8例行MRI检查,其中6例包含扩散加权成像(DWI)序列。8例MRI检查中2例行MRI平扫,4例行MRI平扫加增强检查,2例只行MRI增强检查;其中7例同时行CT及MRI检查。结果病变均为单发,起自板障。9例CT平扫示颅骨呈膨胀性改变,7例密度不均,其中5例病变可见钙化;2例病变密度均匀。6例MRI平扫,4例呈以长T1、长T2为主混杂信号,1例呈均匀长T1、长T2信号,1例呈短T1、长T2信号。6例DWI序列中5例呈高信号,1例呈低信号;表观扩散系数(ADC)图重组后,1例呈稍高信号,1例呈高信号,4例呈稍低信号。6例MRI增强检查,2例病变无强化;4例病变内部和/或边缘强化,同时1例邻近硬膜明显强化。结论SEC的CT及MRI表现有一定的特征性,影像学检查有助于其定位及定性诊断。
Objective To study the CT and MR features of skull epidermoid cyst.Materials and Methods CT and MRI findings of 10 cases with skull epidermoid cysts confirmed by surgery and pathology were summarized and analyzed.Plain CT scans were performed in 9 cases.MRI scans were performed in 8 cases,2 patients of which examined by MRI plain scan and 2 examined by contrast-enhanced scan.4 patients examined by both MRI plain scan and contrast-enhanced scan.Both CT and MRI examinations were performed in 7 cases.Results All cases were solitary and expansile lesions.On CT,7 cases demonstrated inhomogeneous density,5 of which showed calcification.2 cases presented homogeneous density.4 cases showed heterogeneous hypointensity on T1-weighted imaging and heterogeneous hyperintensity on T2-weighted imaging.1 case demonstrated homogeneously low signal intensity on T1-weighted imaging and high signal intensity on T2-weighted imaging.1 case presented high signal intensity on both T1 and T2-weighted imaging.On diffusion weighted imaging,5 cases showed hyperintensity,while 1 case showed hypointensity.1 case showed mild hyperintensity and 1 case presented hyperintensity on ADC maps.The other 4 cases demonstrated mild hypointensity.On enhanced T1-weighted imagings,2 cases presented no enhancement and 4 cases showed enhancement.The dura was enhanced in 1 case at the same time.Conclusion CT and MR appearances are helpful in diagnosis of skull epidermoid cyst.
出处
《临床放射学杂志》
CSCD
北大核心
2010年第3期312-315,共4页
Journal of Clinical Radiology
