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FIG 2. ;t1Case 2: Disk cyst.
A, Sagittal T1-weighted image (right paramedian). A small herniated L4-L5 disk is seen (large white arrow). Just below the herniated disk, a cystic mass is visible.
B, Axial T2-weighted image just below the L4-L5 level. A cystic mass is present in the right anterior extradural space. The dural sac is slightly deformed by this mass. Mild erosion of the right posterior bony wall of L4 is seen (white arrows). The lesion is nearly isointense with CSF.
C, Enhanced axial T1-weighted image (same level as that shown in fig 2B). The mass exhibits rim enhancement.
D, CT diskography at the L4-L5 level depicts water-soluble iodine contrast material in the L4-L5 disk (arrows).
E, CT diskography at the L5 level. Contrast material spills over and accumulates in the right anterior epidural space (white arrowheads).
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