Table 2. Grading of Nerve Root Compromise.

Grade	Posterior Disc Hernation	Lateral Recess Stenosis	Neural Foraminal Stenosis		Extraforaminal Disc Herniation
	2D & 3D	2D & 3D	2D & 3D	3D	2D & 3D	3D
	Axial	Axial	Sagittal	Coronal	Axial	Coronal
0	No compromise	No compromise	No compromise	No compromise	No compromise	No compromise
1	Contact	Contact (one side)	Contact (< 180°)	Contact (2 sides, but not on the same craniocaudal line)	Contact	Contact (inferior portion of nerve)
2	Deviation	Contact (both sides, anterior and posterior) or medial deviation	Contact (180°≤, ≤ 360°)	Contact (2 sides, on the same craniocaudal line)	Deviation (posterolateral)	Deviation (superolateral)
3	Compression	Compression	Compression	Compression	Compression (decreased thickness)	Compression (decreased thickness)

2D = two-dimensional, 3D = three-dimensional