Grading of Chiari-like malformation and syringomyelia according to the British Veterinary Association/Kennel Club Chiari-like malformation and Syringomyelia Health Scheme.

Syringomyelia is defined as a fluid-filled cavity that includes or is distinct from the central canal of the spinal.Pre-syrinx is defined as spinal cord oedema, and may be a transitional state prior to development of syringomyelia. Pre-syrinx has the appearance of high signal intensity on T2-weighted images consistent with marked increased fluid content within the spinal cord substance but not of free fluid. On T1-weighted images the spinal cord is either normal or has a slightly hypointense signal [32].