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Fig. 4F —63-year-old man on hemodialysis for 31 years for chronic
glomerulonephritis with biopsy-proven dialysis-related amyloidosis. Axial
T2-weighted MR image (1,250/26) of atlantoaxial joint shows pseudotumoral mass
of periodontoid soft tissue (arrowheads) bulging into anterior
subarachnoid space and resembling rheumatoid pannus. Pseudotumors are observed
at site of synovial or ligamentous structures, namely, atlantoaxial joint
synovium and transverse ligament.
