Selected images MR images from different patients covering the spectrum of positive findings. (A–C) Grade II synovitis of the distal radio-ulnar joint and active tenosynovitis from 2° to 6° extensor compartments. (A) Coronal T1FatSat after IV contrast administration. (B) Axial T1FatSat pre-contrast. (C) Axial T1FatSat after contrast administration. Note the active enhancement in the synovium of the joint (arrows), and tendon sheaths (arrowheads) after IV contrast administration. (D–E) Grade 1 erosions and grade II bone marrow oedema. (D) Coronal T1WI, depicting small erosions at the proximal aspect of the scaphoid and lunate (arrowheads). (E) Coronal STIR, shows associated bone marrow edema (arrow). (F) Axial STIR image at the level of the middle phalanges, showing extensor peritendinous edema (peritendinitis) in the third finger (tailed arrows)