Peetrons Philippe A, Derbali Wafa
Department of Radiology, Hopitaux Iris Sud, Brussels, Belgium.
Semin Musculoskelet Radiol. 2013 Feb;17(1):28-33. doi: 10.1055/s-0033-1333911. Epub 2013 Mar 13.
Ultrasound (US) of the carpal tunnel adds value to the usual electrophysiology diagnosis by confirming doubtful results or evaluating patients who do not improve after surgery. US sometimes provides the surgeon or the referring physician with important information about normal variants or common or even rare causes of the nerve compression. The size of the median nerve must be calculated in the short axis by measuring the nerve cross-sectional area where the nerve is the thickest, in most cases at the proximal entrance of the carpal tunnel. Because the threshold of the nerve size varies in the literature, it is best to consider the cross-sectional median nerve area <8 mm(2) to rule out and ≥12 mm(2) to rule in the diagnosis of carpal tunnel syndrome.
腕管超声检查（US）通过确认可疑结果或评估术后未改善的患者，为常规电生理诊断增添价值。超声有时能为外科医生或转诊医生提供有关正常变异或神经受压常见甚至罕见原因的重要信息。正中神经的大小必须在短轴上通过测量神经最粗处的神经横截面积来计算，大多数情况下是在腕管近端入口处。由于文献中神经大小的阈值各不相同，最好将正中神经横截面积<8mm²作为排除标准，≥12mm²作为诊断腕管综合征的纳入标准。
