Title page Normal MRI-based appearances of the temporomandibular joints in children aged 2-18 years Angenete Oskar W 12 , Augdal Thomas A 34 , Jellestad Stig 5 , Rygg Marite 67 , Rosendahl Karen 89 Address of correspondence: Oskar W Angenete Department of Radiology and Nuclear Medicine St Olav Hospital HF Postboks 3250 Sluppen NO 7006 Trondheim Norway oskar.angenete@stolav.no Acknowledgements: Parts of this study was funded by the Liaison Committee between the Central Norway Regional Health Authority (RHA) and the Norwegian University of Science and Technology (NTNU) Conflict of Interest: The authors declare that they have no conflict of interest Keywords: ”arthritis, juvenile”, ”observer variation”, ”contrast enhancement”, “joint fluid”, “bone marrow” 1 Department of Radiology and Nuclear Medicine, St Olav Hospital HF, Trondheim University Hospital, Norway 2 Department of Circulation and Medical imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway 3 Department of Radiology, University Hospital of North Norway, Tromsø, Norway 4 Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway 5 Department of Radiology, Haukeland University Hospital, Bergen, Norway. 6 Department of Laboratory Medicine, Children´s and Womens Heatlth, Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Trondheim, Norway 7 Department of Pediatrics, St Olav Hospital, Trondheim University Hospital, Norway 8 Department of Radiology, Haukeland University Hospital, Bergen, Norway 9 Department of Clinical Medicine, University of Bergen, Bergen, Norway