Fig. 3

H&E Stain Depicting Abrupt Transition of Epithelioid and Dedifferentiated (rhabdymyosarcomatous) Components of GIST: epithelioid component (Left) and dedifferentiated (rhabdomyosarcomatous) (right) components of GIST at 100X magnification (a). Mitotic activity at abrupt transition area shown by immunohistochemical stain for proliferative index Ki-67 at 50X magnification (b)