Table 1.

Wildermuth’s MR grading system for lumbar foraminal stenosis

Grade
0	Normal foramina [normal dorsolateral border of the intervertebral disk and normal form at the foraminal epidural fat (oval or inverted pear shape)]
1	Slight foraminal stenosis and deformity of the epidural fat, with the remaining fat still completely surrounding the exiting nerve root
2	Marked foraminal stenosis, with epidural fat only partially surrounding the nerve root
3	Advanced stenosis with obliteration of the epidural fat