CT and MRI each
have a role in exploration of the pelvic fossa when
sciatic compression is suspected in those regions.
Disk bulging and related minor deformities generally
do not cause compression of nerve roots
and are not an explanation for persistent sciatic
The clinician should be aware that a high rate
of minor abnormalities are seen on MRI in patients
without back or radicular symptoms but
that disk rupture is seen in less than 1% of asymptomatic
patients.