Figure 1
From: Cervical spine involvement in patients with juvenile idiopathic arthritis - MRI follow-up study
9-year-old girl with JIA at first diagnosis of cervical arthritis (3 mm coronal T1 spinecho sequence with fat saturation). Malalignment of occiput, atlas and axis. Contrast enhancement of atlanto-occipital joints with a small erosion of the right and a large erosion of the left lateral mass of the atlas (long arrows). Contrast enhancement of the bone marrow in the atlas (short arrow). Contrast enhancement of the widened left atlanto-axial joint (two short arrows).