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Table 1 Classification of intervertebral disc degeneration

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

  1. Self-developed grading system to classify canine intervertebral disc degeneration
  2. Abbreviations: AF Anulus fibrosus; IVD Intervertebral disc; M. long. dorsi Musculus longissimus dorsi; NP Nucleus pulposus