Table 1 Pfirrmann MRI grading [17]
From: Degenerative changes of the canine cervical spine after discectomy procedures, an in vivo study
Grade | Structure | Distinction of Nucleus Pulposus | Signal intensity | Height of intervertebral disc |
|---|---|---|---|---|
I | Homogeneous, bright white | Clear | Hyperintense, isointense to cerebrospinal fluid | Normal |
II | Inhomogeneous with or without horizontal bands | Clear | Hyperintense, isointense to cerebrospinal fluid | Normal |
III | Inhomogeneous, gray | Unclear | Intermediate | Normal to slightly decreased |
IV | Inhomogeneous, gray to black | Lost | Intermediate to hypointense | Normal to moderately decreased |
V | Inhomogeneous, black | Lost | Hypointense | Collapsed disc space |