Fig. 1

Twelve-year-old male JIA patient, persisting clinical symptoms with methotrexate treatment. DWI b = 800 s/mm² (a), ADC map (b), contrast-enhanced MRI (c) and image fusion (d) of colorised overlay of DWI signal onto image (c) with 3D Fusion software (Siemens Medical) all show active synovitis and small amounts of joint effusion in the anterior and posterior joint space. Image acquisition with multi-shot read-out segmented DWI (RESOLVE, Siemens) is virtually free of artifacts