摘要
目的：评估颅内表皮样囊肿的ＣＴ和ＭＲＩ表现。材料和方法：４７例经手术和病理证实的表皮样囊肿中，１０例行ＣＴ平扫和增强，其中９例同时行ＭＲＩ检查；另有３７例作常规ＭＲＩ检查，其中１３例还加作ＦＬＡＩＲ序列，１０例行增强扫描。结果：肿瘤位于桥小脑角２５例，鞍区及鞍旁８例，颅中窝底６例，脑内３例，松果作区２例，第四脑室内２例，小脑天幕处１例。４７例中不规则形３０例，圆形或类圆形１７例。ＣＴ平扫表现为均匀低密度者６例，混合密度者２例，高密度者２例，３例可见钙化，造影后均未见明显强化。ＭＲＩ上病灶显示Ｔ１ＷＩ呈低信号，Ｔ_２ＷＩ呈高信号者３８例， Ｔ_１ＷＩ及Ｔ_２ＷＩ呈高低混杂信号者４例， Ｔ_１ＷＩ呈高信号， Ｔ_２ＷＩ呈高低混杂信号者４例。９例作造影检查无甚强化表现，仅１例呈轻度环状强化。未见脑水肿表现，占位效应甚轻。ＦＬＡＩＲ序列病灶信号均有升高。结论：颅内表皮样囊肿的ＣＴ和ＭＲＩ表现较为特征，尤其是ＭＲＩ能作出术前准确诊断；ＦＬＡＩＲ序列有助于鉴别表皮样囊肿和蛛网膜囊肿。
Purpose: To estimate the diagnostic value of CT and MRI of intracranial epidermoid cyst. Materials and methods: 47 patients with epidermoid cyst proven by surgery and pathology had undergone CT and MRI examination. 10 patients were taken pre - and post - enhancement CT scan. 9 of 10 patients were taken MRI examination.Another 37 patients were proceeded with MRI, 13 of 37 patients were examined with FLAIR sequence additionally and 10 patients with Gd - DTPA. Results: 25 tumors located in CPA, 8 in sellar or parasellar region, 6 in the middle cranial bottom, 2 in the fourth ventricle, 2 in pineal region, 3 in parachyma and 1 nearby tentorial; 30 tumors with irregular shape, 17 with oval shape; 38 patients with hypointense signal on T1WI while hyperintense signal on T2WI , 4 patients display inhomogenenous signal on T1 WI and T2WI, and 4 patients were hyperintense on T1WI while inhomogenenous signal on T2WI; no obvious enhencement but one with slight ring enhancement can be seen; there was no striking brain ede- ma or mass effect; signal intensity of tumor elevated on FLAIR sequence. Conclusion: The manifestation of CT and MRI of epidermoid cyst is characteristic, especially MRI can detect it precisely; FLAIR se- quence is helpful to differentiate epidermoid cyst from arachnoid cyst.
出处
《中国医学计算机成像杂志》
CSCD
2000年第3期149-152,共4页
Chinese Computed Medical Imaging
