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Grade of nerve root compression.
A. Grade I (abutment); the herniated disc abuts the nerve root, but the nerve root is in its normal position.
B. Grade II (displacement); the herniated disc material displaces the nerve root, but the displaced nerve root can be seen by MRI.
C. Grade III (entrapment); the nerve root is entrapped between the herniated disc and the lamina or facet. The entrapped nerve root is hardly detected by MRI.
