椎管内表皮样囊肿的MRI表现

目的:探讨椎管内表皮样囊肿的MR表现。方法:回顾性分析16例经手术病理证实的椎管内表皮样囊肿的 MRI表现。常规行SE T1WI、TSE T2WI和STIR扫描,14例行Gd-DTPA增强扫描。结果:16例中12例病灶位于髓外硬膜下,4例位于脊髓内,合并其它先天畸形6例。MR表现为T1WI上呈低信号8例,等、低混杂信号6例,等、低、高混杂信号2例;T2WI上呈高信号10例,等、高混杂信号5例、等、低混杂信号1例;3例肿瘤内有脂肪信号。11例患者行增强扫描,肿瘤内部均无强化,肿瘤边缘轻度强化2例。结论:椎管内表皮样囊肿的MRI表现有一定特征性,除与皮样囊肿鉴别困难外,与其它椎管内肿瘤容易鉴别。

MRI Diagnosis of Epidermoid Cyst in Spinal Canal

Objective:To study the MR features of epidermoid cyst in the spinal canal. Methods:Sixteen patients with pathology proved epidermoid cyst of spinal canal were studied. Results: Location of the lesions were in subdural space (n = 12) or within the spinal cord (n=4). On MRI,-tumors showed low signal intensity (n=8) ,iso-/low intensity (n=6),and iso-/high intensity (n=2) on T1WI;high signal intensity (n=10) ,iso-/high intensity (n=5) ,iso-/low intensity (n=1) on T2WI. Fat signal intensity was found in three cases. After iv contrast enhancement, tumors showed slightly peripheral enhancement (n=2) ,no enhancement (n=9). 6 cases complicated with other congenital deformation. Conclusion:On MRI,epidermoid cyst in the spinal canal showed low or iso-/low signal intensity on T1WI and high or iso-/high intensity on T2WI, and demonstrated slightly peripheral enhancement or no enhancement after contrast administration. Apart from dermoid cyst,epidermoid cyst could be easily distinguished from other spinal canal tumors on MRI.