Fig. 12

Eosinophilic granuloma. Sagittal T1 image (a) demonstrates suggestion of vertebral plana (orange arrow), however difficult to detect due to the lesion appearing isointense to pediatric marrow on T1. Sagittal T1 post-contrast MR image (b) shows an enhancing mass (orange arrows) with diffuse marrow infiltration of C5 and C7 (white arrows), and C6 pathologic vertebral collapse, sparing the adjacent vertebral endplates and discs. Sagittal T2 (c) and T2 fat -saturated (d) images demonstrate the lesion as a heterogeneously hyperintense soft tissue mass. There is edema of the posterior interspinous soft tissue, more evident on fat suppressed image (blue arrows). Axial T1 post contrast image (e) demonstrates asymmetric enhancement surrounding the right facets (orange arrow)