Fig. 3

MRI thighs pre- and post-rituximab therapy. Axial a T1-weighted FSE and b STIR images of the upper thighs in May 2018 showing patchy oedema within the bilateral vasti, adductors and hamstrings. Signal abnormality in the left vastus lateralis is most conspicuous (white arrow). Subsequent axial c T1-weighted FSE and d STIR images of the same region in March 2019 demonstrate complete resolution of oedema. Muscle bulk remains normal on both studies with no fatty infiltration