Figure 2

Pre- and postoperative images of Case 2. (A) (B) Preoperative axial computed tomography (CT) scans (one year before admission) showing a high-density lesion with partial destruction of occipital cranium. (C) (D) Preoperative axial magnetic resonance imaging (MRI) scans (admission) of the tumor displaying a nearly equal T1 signal (partially high signal) with peripheral enhancement and extradural extension. The swelling experienced a spurt in growth over one year. (E) (F) Preoperative sagittal MRI scans showing a contrast-enhancing lesion in the occipital region with dural and bony involvement. (G) Preoperative axial MRI scan of the tumor displaying mixed T2 signals. (H) The skin incision during the operation. (I) (J) Postoperative CT scans demonstrating that the tumor was nearly completely resected. (K) Postoperative pathological examination of the tumor. Hematoxylin and eosin (H&E) staining revealed that the tumor consisted of a diffuse or fascicular proliferation of spindle-shaped cells. Mitotic figures were common (×200). (L) Strong, positive immunoreactivity to the antibody vimentin (×200).