摘要
目的:分析椎管内脊膜囊肿的MR表现特点,并对其发生及MRI诊断价值进行讨论。材料与方法:本组18例,男12例,女6例,年龄7～59岁,平均32.5岁。MR扫描采用SE序列TWI、TWI矢状面和轴面扫描。6例加做MR12增强扫描。结果:18例均经手术病理证实,并按Nabors方法分为3型:Ⅰ型为不伴神经根纤维的硬脊膜外囊肿,又分2个亚型:Ⅰa型和Ⅰb型。其中椎管内硬膜外脊膜囊肿(型)例,骶管内脊膜囊肿(Ⅰa3Ⅰb型)例;Ⅱ型为伴神经根纤维的硬8脊膜外囊肿(例);Ⅲ型为椎管内硬膜下脊膜囊肿(例)。椎管内脊膜囊肿可为长条状囊袋形、卵圆形或不规则形等,囊液34信号与脑脊液信号相似,TWI呈低信号,TWI呈高信号。可引起椎管扩大,并致脊髓或椎体受压,引起硬膜外脂肪移位。12结论:MRI是椎管内脊膜囊肿最好的检查方法之一,其影像表现较具特征性,正确认识其MR征象能达到术前诊断,并指导治疗。
Objective: To analyze the characteristics of spinal meningeal cyst(SMC) or arachnoid cyst on MRI and discuss its etiology as well as MRI diagnostic value. Materials and Methods: There were 18 cases, 12 of them were men, 6 were women, the median age of the patients was 32.5 years old(7～59 years old). All the patients underwent MR scanning with T1-weighted sequence in the sagittal plane and T2-weighted sequence in both sagittal and axial plane. Six of them were also examined with the enhanced MRI. Results: All the patients were confirmed by surgery and histopathology, and were classified into 3 types according to Nakors's method, Type Ⅰ was extradural meningeal cyst without involving the spinal nerve roots, it was subdivided into type Ⅰa(3 cases) and Ⅰb(8 cases);Type Ⅱ as extradural meningeal cysts of the spinal nerve root fibers(4 cases); Type Ⅲ as spinal intradural meningeal cysts(3 cases). SMC have the appearance of elongated saccular, round or irregular shape, the fluid in the cysts gave the same signal as cerebrospinal fluid on all MRI sequences, low signal intensity on T1-weighted imaging and high intensity on T2-weighted imaging. SMC can expand spinal canal, compress the spinal cord and vertebral body, and displace extradural fat. Conclusion: MRI is one of the best ways to diagnose SMC, its manifestations on MRI are typical and characteristic. Accurate understanding of these MRI manifestations is helpful to obtain pre-operation diagnosis and direct the treatment.
出处
《中国临床医学影像杂志》
CAS
2004年第2期91-94,共4页
Journal of China Clinic Medical Imaging
关键词
蛛网膜囊肿
磁共振成像
arachnoid cysts
magnetic resonance imaging
