L5-S1 Disk Extrusion

Unknown Spine Case 1


35 y/o male with a history of right leg pain.

Image Findings

A focal extrusion of the disk is seen at the L5-S1 level on sagittal and axial images. A disk protrusion is seen at the L3-L4 level.


Disk extrusions are characterized by a relatively narrow base compared to a broad base for disk protrusions. In extrusions, the nucleus has ruptured completely through the annulus. In protrusions, some annular fibers remain. Asymptomatic disk protrusions are not infrequent, unlike extrusions.
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Last modified April 3, 1995
Copyright 1995 Ray Ballinger, University of Florida and VA Medical Center, Gainesville, FL.
URL: http://www.xray.ufl.edu/~rball/teach/376.html