Figure 3
A) GIST infiltrating adjacent Pancreas; asterisk = pancreatic glands and ducts, arrows = GIST [hematoxylin-eosin staining, Original magnification 50×]. B) GIST perforating into the lumen of the duodenum; asterisk = mucosa of the duodenum, arrowheads = ulceration, arrows = GIST [hematoxylin-eosin staining, Original magnification 50×] C) Immunohistochemical staining for Vimentin showing positive reaction in almost all cells (red colour) [Original magnification 400×] D) Cells of the GIST with spindle-shaped nuclei (arrows) and admixed lymphocytes and granulocytes [hematoxylin-eosin staining, Original magnification 400×] E) Immunohistochemical staining for CD117 (c-kit) showing positive reaction in almost all cells (red colour) [Original magnification 400×] F) Immunohistochemical staining for Ki-67 showing proliferation in approximately 5-10% of cells (red nuclear signal, arrows) [Original magnification 400×].