Fig. 5

Histological findings. a Hemorrhagic change indicated by granulation tissue (with hemosiderin deposition) and focal red blood cells (with fibrin) within the intravertebral scalloped lesion (hematoxylin and eosin staining). b Degeneration of the ligamentum flavum within the epidural tumorous lesion and the formation of granulation tissue in an adjacent region (hematoxylin and eosin staining). c Direct fast Scarlet stain showing the focal deposition of amyloid within the scalloped and epidural lesion. Green birefringence was confirmed with a polarized filter. These findings indicate a chronic epidural hematoma, which is a non-neoplastic change