From: Evaluation of canine intervertebral disc degeneration in colour-coded computed tomography
Grade | Structure | Distinction between NP and AF | Attenuation | Height of IVD |
---|---|---|---|---|
1 | Homogeneous | Lost | Isodense to M. long. dorsi | Normal |
2 | Homogeneous | Slightly-clearly visible | NP isodense to M. long. dorsi; AF hyperattenuating to M. long. dorsi | Normal |
3 | Nonhomogeneous | Clearly visible | One dot-like homogeneneous, hyperattenuating Mineralisation often within the NP; AF iso-/hyperattenuating to M. long. dorsi | Normal to slightly decreased |
4 | Nonhomogeneous | Clear or hidden by mineralised material | Multiple small or one bigger hyperattenuating Mineralisation, which cover up to 1/3 of the IVD AF iso-/hyperattenuating to M. long. dorsi | Normal to moderatly decreased |
5 | Nonhomogeneous | Hidden by mineralised material | Hyperattenuating, inhomogeneous Mineralisation which cover at least 1/3 of the IVD; diffus hyperattenuating to M. long. dorsi; AF iso-/hyperattenuating to M. long. dorsi | Collapsed disc space |