Descriptions of spinal MRI lesions and definition of a positive MRI of the spine in axial spondyloarthritis: a consensual approach by the ASAS/OMERACT MRI study group

Kay-Geert A Hermann, Xenofon Baraliakos, Désirée M F M van der Heijde, Anne-Grethe Jurik, Robert Landewé, Helena Marzo-Ortega, Mikkel Østergaard, Martin Rudwaleit, Joachim Sieper, Jürgen Braun, Assessment in SpondyloArthritis international Society (ASAS)