CPPD mimicking spinal neuroarthropathy. (A) Thoracic CT sagittal view. Osseous erosions and sclerosis of the endplate of T10 and the superior endplate of T11 with gas within the disc space. The white arrow points to the epidural mass. (B) A still image of a video demonstrating positively birefringent crystals under polarized microscopy within the resected epidural mass. The full video is available in Supplementary Data S1, available at Rheumatology online