脊髓表皮样囊肿的MR诊断

目的分析脊髓表皮样囊肿的ＭＲ表现，以提高对该病的神经放射学认识。材料与方法搜集１８例经手术病理证实的脊髓表皮样囊肿。重点分析了肿瘤的好发年龄、部位、ＭＲ信号特点和肿瘤的增强情况。结果在本组病例中，病人年龄最小４岁，最大４２岁，平均年龄２４．５岁。本组病例全部发生于圆锥附近，边缘清楚。大部分肿瘤长度小于２个椎体长度（１６／１８），２例肿瘤长度大于３个锥体长度，Ｔ１加权像肿瘤呈均匀的等（６／１８）、高（２／１８）和混杂信号（１０／１８）。Ｔ２加权像呈高信号，边缘可呈等Ｔ２信号。在７例行增强扫描的病人中，有４例肿瘤周围可见轻微强化，３例无强化。９例肿瘤内可见脂肪信号。本组中未见其他有关先天性畸形。结论脊髓内表皮样囊肿的ＭＲ表现较具特征性。该病多见于青年患者，好发于圆锥附近，多呈长Ｔ１、Ｔ２信号。增强扫描无或仅有周围轻微强化。

The MR features of spinal cord epidermoids

Purpose To analyze the MR features of spinal cord epidermoids. Materials and methods Eighteen patients (4-42 years mean 24.5) with pathologically proven spinal cord epidermoids were studied. MR features of these tumors were analyzed with emphasis on tumor location, signal characteristics, and contrast enhancement. Results All spinal cord epidermoids were located around the conus. The tumor showed isointensity (5/18), hyperintensity(3/18), and heterogeneous signal intensity on T 1WI(10/18) and marked hyperintense on T 2WI. On contrast enhanced studies, the tumors exhibited minimal peripheral enhancement(4/7) or no enhancement(3/7). Fat signal was found on T 1WI in 9 cases. Conclusion The spinal cord epidermoids most likely occurred around the conus region in young adult patients. The tumor tended to show heterogeneous signal intensity on T 1WI and hyperintensity on T 2WI, with minimal peripheral contrast enhancement.