Fig. 4.

A 61-year-old woman with delayed post-traumatic vertebral collapse of L1 (pattern D, mixed pattern). (A) Spin echo T1-weighted (367/18) sagittal MR image shows an area (arrow) of hypo-intense signal intensity with a region of signal void (arrowhead). (B) Fast spin echo T2-weighted (2,400/105) sagittal image obtained at the same level as in A shows a region (arrow) of hyperintense signal intensity similar to water and an area of signal void (arrowhead). (C) Corresponding photomicrograph of the specimen reveals bone necrosis (curved arrow), reactive new bone (open arrow), and granulation tissue (straight solid arrow).