A, CT scan scout view of lumbar disc herniation at lumbar disc level showing angled gantry technique. B, CT scan scout view of straight gantry technique. C, CT scan of lumbar disc herniation at L4-5 disc level showing cross-sectional anatomy with gantry straight. D, CT scan of L4-5 disc herniation at lumbar disc level showing cross-sectional, sagittal, and coronal anatomy using computerized reformatted technique. E, CT scan of L4-5 disc herniation at lumbar disc level showing cross-sectional anatomy 2 hours after metrizamide myelography. F, CT scan of lumbar disc herniation at L4-5 disc level showing cross-sectional anatomy after intravenous injection for greater soft-tissue contrast.