Figure 20.

A 32-year-old male with ankylosing spondylitis (AS). A) Sagittal reformatted computed tomography (CT) image of the lumbar spine shows reactive sclerosis at the periphery of the superior and inferior endplates at multiple levels consistent with shiny corners secondary to inflammatory erosions (arrows). Note mild anterior squaring of the vertebral bodies, most prominent at L5 and partial fusion of the posterior elements. Sagittal (B) T2-weighted with fat-saturation and (C) T1-weighted (T1W) magnetic resonance (MR) images show signal hyperintensity at the shiny corners (arrows)