Fig. 3From: Lumbar spine MRI versus non-lumbar imaging modalities in the diagnosis of sacral insufficiency fracture: a retrospective observational studyA 68-year-old woman with SIF involving the bilateral sacral alae. a Sagittal T1-weighted MR image shows irregular signal alteration suggesting mild bone marrow edema at the left sacral alae. b Axial T1-weighted MR image at the proximal S1 level shows hypointense fracture lines with surrounding bone marrow edema at both sacral alae. c Axial T2-weighted MR image at the same level shows hypointense fracture lineBack to article page