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CT images from a 66-year-old female patient with back pain and stiffness. Sagittal (A and B) and axial (C) CT demonstrate features of spinal ankylosis relating to inflammatory spondyloathropathy (blue arrows). AO is evident by thick peripheral ossification of the meninges most prominent at the tip of the thecal sac; however, it can also be seen in the thoracic spine (red arrows).
