Syringomyelia cavities come in “all shapes and sizes”, from small cyst-like structures, limited to one part of the spinal cordThe main nerve trunk running down the spinal canal and connecting the individual’s mind and consciousness to the rest …, through to large, tensely distended cavities that may involve the entire length of the spinal cordThe main nerve trunk running down the spinal canal and connecting the individual’s mind and consciousness to the rest ….