Legend Sag T2W: Large disc extrusion at L5-S1, displacing traversing nerve roots. Ax T1W and Ax T2W: Extrusion is left paracentral, impressing on the thecal sac and filling the left lateral recess, compressing the traversing left S1 and S2 nerve roots.

Legend Sag and Ax T2W, Ax T1W: nearly identical radiographic findings 6 weeks post-op, with new post-surgical changes in the posterior soft tissues.

Legend Sag and Ax T1W: Post gadolinium, extensive enhancement is seen in the surgical bed and surrounding the low T1W signal in the region of the previous extrusion. Key words: mri degenerative

Spine Diagnosis: Recurrent disk extrusion