“…2 The term ''hydromyelia'' refers to a dilatation of the central canal, and ''syringomyelia'' refers to a fluid-filled cavity outside of the spinal canal, typically with gliotic walls. 12,16 Although Roser et al 17 distinguished between syringomyelia and hydromyelia using electrophysiological methods, in this study, we used the term ''syringomyelia'' to describe broadly both types of fluid-filled cavities within the spinal cord because it is difficult to distinguish between these two abnormalities in practice, and many spinal cord cavities have features of both conditions. 12,16…”