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目的探讨MRI对颅内不典型表皮样囊肿的诊断价值。方法搜集26例经手术病理证实的不典型表皮样囊肿患者MRI T1WI、T2WI、扩散加权成像(DWI)及增强检查资料,分析其部位、形态及信号特点。结果 11例表皮样囊肿位于脑室内,12例位于脑实质内,2例位于硬膜外,1例位于大脑纵裂前部。呈类圆形、不规则或分叶状,周围均无水肿。脑室内、大脑纵裂肿瘤信号呈均匀或不均匀长T1、长T2信号;脑实质内、硬膜外肿瘤信号复杂多样,T1WI、T2WI呈混杂信号,可见T1WI高信号,或T2WI低信号。DWI均呈明显高信号。增强扫描4例囊壁强化。结论 DWI结合T1WI、T2WI及增强扫描对颅内不典型表皮样囊肿的诊断及鉴别诊断有重要价值。
Objective To investigate the diagnostic value of MRI in the diagnosis of atypical epidermoid cyst. Methods MRI T1WI, T2WI, diffusion weighted imaging (DWI) and enhancement examination data were collected from 26 cases of atypical epidermoid cysts proved by operation and pathology, and their location, morphology and signal characteristics were analyzed. Results Eleven cases of epidermoid cysts were located in the ventricle, 12 cases were located in the parenchyma, two in the epidural and one in the anterior part of the brain. Was round, irregular or lobulated, no edema around. Longitudinal T1 and long T2 signals of intracerebroventricular tachyphrenic tumor showed homogenous or non-uniform tumor signal. The intraparenchymal and epidural tumor signals were complex and diverse. T1WI and T2WI were mixed signals with high T1WI signal or low T2WI signal. DWI were significantly higher signal. Enhanced scan 4 cases of cyst wall enhancement. Conclusion DWI combined with T1WI, T2WI and enhanced scan of intracranial atypical epidermoid cysts diagnosis and differential diagnosis of great value.