Table 4. Grading Criteria for Cervical Neural Foraminal Stenosis.

Grade	Severity	Description
Grade 0	Normal	The narrowest width of the neural foramen is greater than the width of the extraforaminal nerve root at the level of the anterior margin of the superior articular process.
Grade 1	Non-severe	The narrowest width of the neural foramen is 51%–100% of the width of the extraforaminal nerve root at the level of the anterior margin of the superior articular process.
Grade 2	Severe	The width of the neural foramen is the same as or less than 50% of the width of the extraforaminal nerve roots.