PMC10228228_01
T1 sagittal and axial contrast-enhanced MRI obtained prior to surgery, showing focal, small, lobulated fluid collection at the posterior epidural space of L4-L5 (arrows 1 and 3), with adjacent soft-tissue swelling at the epidural space and posterior column of the L4-L5 level (arrows 2 and 4).
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Infective arthritis over the L4-L5 facet joint with adjacent epidural abscess formation leading to severe spinal stenosis at the L4-L5 level was concluded by the radiologist (Figure 1).
T1 sagittal and axial water-suppression contrast-enhanced MRI obtained approximately 1 month after surgery, showing early stage of infective spondylodiscitis between L4 and L5 (arrow 5) and Baastrup's disease between L3 and L4 with secondary abscess transformation (arrows 6 and 7).
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In addition, an early stage of infective spondylodiscitis was noted at L4-L5 (Figure 2).