MRI of Acute Low Back Pain: About an Uncommon Pitfall.

Posteriorly migrated disc extrusion may mimic tumoral masses on MRI with contrast; still, this diagnosis must be evoked in patients presenting acute low back pain with a posterior epidural mass. We describe a case of epidural posterior migration of an inflammatory lumbar disc herniation in a young patient with acute lumbosciatica. MRI showed an intracanalar mass with intense global enhancement, which is an uncommon feature of this rare condition.