PMC6826273_01
(a) Sagittal T2-weighted magnetic resonance imaging (MRI): L4-L5 interspinous ligament degeneration/sclerosis (e.g., hypointense streak (arrow) and severe canal stenosis. (b) Axial T2-weighted MRI upper L5 level: lumbar canal stenosis with severe thecal sac compression/hypertrophied ligamentum flavum/facet arthrosis. (c) Sagittal noncontrast computed tomography section lumbosacral spine: sclerosis/flattening of spinous processes of L4/L5 (arrow). (d-f) Axial T1 contrast MR: abnormal ill-defined enhancement - "atypical" Baastrup's disease (arrows).
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F1
The contrast MR revealed soft tissue enhancement of the paraspinal musculature, and dorsal to the thecal sac, an inflammatory and/or infectious compressive process [Figure 1].