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Table 1 Modified Dallas discogram scale

From: Factors associated with lumbar disc high-intensity zone (HIZ) on T2-weighted magnetic resonance image: a retrospective study of 3185 discs in 637 patients

Grade Morphology of CT discograms
0 Normal disc
1 Radial fissure involving the middle third of the annulus
2 Radial fissure extending to the middle third of the annulus
3 Radial fissure extending to the outer third of the annulus but involving < 30° of the disc circumference
4 Radial fissure extending to the outer third of the annulus and involving > 30° of the disc circumference