CMarie,
It depends upon what is pinching the nerve.
If it is from the herniation of a disc, and the nucleus pulposus is in contact with the nerve root. In this case, some surgeons feel that treatment with a steroid dose pack, to decrease the inflammation around the nerve root. Then let the herniated nucleus pulposus resolve on its own.
Other surgeons feel that surgery should be done to remove the herniated disc material that is pressing on the nerve root.
If it is some other structure that is compressing the nerve, then it is up to the surgeon to determine if the problem will be persistent or if it will resolve. Usually, though, if it is due to an osteophyte (bone spur), facet joint hypertrophy, hypertrophy of the ligaments around the lateral recess and neural foramen (where the nerves exit the spine), these structures have to be removed surgically.
However, it is very important for you to go over the MRI, in correlation with your history, symptoms, and physical exam.
Then to come up with a treatment plan, based on that evaluation.
Good luck.