Fig. 3
From: A case of planar-type GIST of the sigmoid colon showing diverticular structure with perforation
Microscopic examination of the histological specimens of the diverticulum structure. a Lower magnification of the H&E staining specimen showed spindle cell proliferation replacing the muscularis propria. b Higher magnification of H&E staining demonstrated that the spindle cells were bland and did not have apparent mitoses. c–e Immunohistochemistry showed that the proliferating spindle cells were diffusely KIT-positive (c), DOG1-positive (d), and CD34-positive (e)