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MRI diagnosis of Hirayama disease
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 4
- DOI:
- 10.3760/j.issn:1005-1201.2007.04.005
- Key Word:
- 肌萎缩;磁共振成像;诊断显像
Abstract： 目的 探讨平山病低位颈髓在自然位和过屈位特殊的动态变化对诊断的价值.方法 对18例临床确诊为平山病的患者和31例正常对照者进行MR自然位和过屈位的矢状面和轴面扫描,测量C6椎体上缘颈髓前后径(APD)和横径(TD),观察其动态改变.结果 (1)自然位,平山病组表现有低位颈髓萎缩(病例组11例,对照组2例,χ2=14.76,P=0.000)和变扁平(病例组7例,对照组1例,χ2=8.15,P=0.004),差异有统计学意义.(2)过屈位,平山病组颈髓均前移后显著变扁,脊膜后有"月牙"形异常信号影.(3)自然位平山病组和对照组APD分别为(5.6±0.7)、(6.7±0.5)mm,过屈位APD分别为(4.3±0.8)、(6.0±0.5)mm,差异均有统计学意义(t值分别为-5.802、-8.952,P值均为0.000).结论 平山病低位颈髓在正常位和过屈位存在特殊的动态变化,过屈位MRI可协助诊断.
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