original scan on bottom, new scan 1 year later on the top 

- on original scan - L4-5 foraminal stenosis- you would expect an L4 radiculopathy since foraminal stenosis affects the exiting nerve root, and the L4 nerve root exist at L4-5. 

- on new scan - now stenosis is at the lateral recess, you an see from the different slices that the traversing nerve roots get crushed by the disk. You would expect an L5 radic since the L5 nerve roots are passing by at this level.