MR images in different patients with SIFs MR images in different patients with SIFs. A, Coronal oblique T1-weighted image demonstrates patchy low-signal intensity edema and a hypointense fracture line. MR images in different patients with SIFs. A, Coronal oblique T1-weighted image demonstrates patchy low-signal intensity edema and a hypointense fracture line. B and C, Coronal oblique inversion-recovery images demonstrate high-signal-intensity edema within the lateral sacrum. Note a horizontal component involving the sacral bodies in C. E.M. Lyders et al. AJNR Am J Neuroradiol 2010;31:201-210 ©2010 by American Society of Neuroradiology