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Fig 3. Postoperative axial and sagittal MR images of lumbar spine before and after administration of intravenous contrast media and noncontrast axial CT scan.
A, An axial T1-weighted (TR, 477; TE, 14) MR image shows a signal void gas accumulation in the right anterolateral epidural space compressing the dural sac and displacing the right L5 nerve root to the posterior.
B, An axial postcontrast T1-weighted MR image at the same level with Fig 1A demonstrates granulation tissue enveloping the signal void gas.
C, A sagittal fat saturated T2-weighted (TR, 3500; TE, 120) MR image reveals the signal void gas collection at the level of L4 vertebra inferior endplate. Disk space narrowing and degeneration at the L4-L5 endplates were also observed.
D, An axial CT scan confirms the ovoid cystlike gas occupying the right lateral recess.
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