脊髓空洞症的磁共振成像

MAGNETIC RESONANCE IMAGING OF SYRINGOMYELIA

本文研究了85例脊髓空洞症的磁共振成像。矢状面扫描可清晰显示空洞的范围和后颅凹的解剖细节,横断面扫描对空洞的形态、脊髓的粗细显示较佳。空洞好发于颈髓和颈胸交界(74％),平均前后径5.8mm,平均累及9.2个脊椎节段。空洞T_1加权成像为低信号;T_2加权成像72％为高信号,28％为低信号。分析了交通性、外伤后、肿瘤性、伴蛛网膜炎及特发性五组空洞症各自的特征。Ghiari畸形并非交通性脊髓空洞症所独有。小脑扁桃体下陷的程度与空洞的大小无关。

Magnetic resonance imaging (MRI) of eighty-five patients with Syringomyelia were studied. Sagittal plane was found take optimal for evaluating the length of the cavity and the anatomic characteristics of the posterior foesa. The axial plane was most useful in evaluating the shape of the cavity and the diameter of the spinal cord. Most of the syringial cavities involved the cervical cord and cervicothoracic junction (74%). The average anterior-posterior diameter of the cavities was 5.8mm and the average length extended over 9.2 vertebral segments. All the syringial cavities appeared tobe of low signal intensity on T1W images. 72% of the Syringial cavities presented with high signal intensity on T2W images and 28% of them appeared with low signal intensity (due to CSF flow void phenomena,, CFVP). Generally, operative results were better for cases with CFVP. The MRI appearances of communicating, posttraumatic, tumorous and arachnoiditic Syringomyelia were analyzed. Differentiation bstween the tumorous syrinx and other types of syrinx was discussed. In tumorous Syringomyelia, the irregular enlargement of the spinal cord was common, the signal intensity of the syrinx was often non-homogeneous, no CFVP presented, and enhanced tumor nodules might be seen in postenhancement acquisition.