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Magnetic resonance images of lumbar and lower thoracic spine: psoriatic arthritis. (a) T1-weighted and (b) short tau inversion recovery (STIR) magnetic resonance images of the lumbar and lower thoracic spine. Signs of active inflammation are seen at several levels (arrows). In particular, anterior spondylitis is seen at level L1/L2 and an inflammatory Andersson lesion at the upper vertebral endplate of L3.
