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From the Department of Radiology, Academic Medical Center, Amsterdam, The Netherlands; Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children's Hospital, Academic Medical Center, Amsterdam, The Netherlands; Department of Radiology, Oslo University Hospital, Oslo, Norway; Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Radiology, University Hospital North Norway, Tromsø, Norway; Pediatric Rheumatology Research Institute, Bad Bramstedt, Germany; Department of Pediatrics, University of Genoa, Genoa, Italy; Department of Pediatric Rheumatology, Reade Institute, location Jan van Breemen, Amsterdam, The Netherlands; Department of Clinical Medicine, K1, University of Bergen, and Department of Pediatric Radiology, Haukeland University Hospital, Bergen, Norway.C.M. Nusman, MSc, Department of Radiology, Academic Medical Center; Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children's Hospital, Academic Medical Center; L.S. Ording Muller, MD, PhD, Department of Radiology, Oslo University Hospital; R. Hemke, MD, PhD, Department of Radiology, Academic Medical Center; Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children's Hospital, Academic Medical Center; A.S. Doria, MD, PhD, Department of Diagnostic Imaging, The Hospital for Sick Children; D. Avenarius, MD, Department of Radiology, University Hospital North Norway; N. Tzaribachev, MD, Pediatric Rheumatology Research Institute; C. Malattia, MD, PhD, Department of Pediatrics, University of Genoa; M.A. van Rossum, MD, PhD, Department of Pediatric Hematology, Immunology, Rheumatology and Infectious Disease, Emma Children's Hospital, Academic Medical Center, and Department of Pediatric Rheumatology, Reade Institute, location Jan van Breemen; M. Maas, MD, PhD, Department of Radiology, Academic Medical Center; K. Rosendahl, MD, PhD, Department o