Table 1:

The modified Pfirrmann grading of disk degeneration

Grade	Structure	Distinction of Nucleus Pulposus and Annulus Fibrosus	Signal Intensity	Height of Intervertebral Disk
I	Homogeneous, bright white	Clear	Hyperintense	Normal
II	Inhomogeneous with or without horizontal bands	Clear	Hyperintense	Normal
III	Inhomogeneous, gray	Unclear	Intermediate	Normal-to-slight decrease
IV	Inhomogeneous, gray to black	Lost	Intermediate to hypointense	Normal-to-moderate decrease
V	Inhomogeneous, black	Lost	Hypointense	Collapsed disk space