PMC4327572_01
a Colonoscopy showed a 5-cm SMT in the ascending colon. b Abdominal computed tomography revealed a tumor in the ascending colon (arrows).
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F1
Contrast-enhanced computed tomography showed a well-defined homogeneously enhanced tumor in the ascending colon (fig. 1b). Colonoscopy showed a 5-cm SMT in the ascending colon (fig. 1a).
a The resected specimen showed a SMT in the ascending colon, with dimensions of 50 x 30 x 25 mm. b The tumor showed a whitish fibrotic and firm cut surface without definitive hemorrhage or necrosis. c The tumor was composed of whorled arranged spindle cells (hematoxylin-eosin staining, x40). d The tumor showed immunoreactivity to S-100 (x40).
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F2
The tumor, 50 x 30 x 25 mm in size, was covered by normal colonic mucosa of the ascending colon (fig. 2a). The tumor was whitish in color and located from the submucosa to the subserosa on the axial plane (fig. 2b). Histological findings of the hematoxylin-eosin-stained specimen revealed spindle-like tumor cells (fig. 2c). Immunohistochemical staining demonstrated lack of reactivity to CD117 (c-kit), CD34 and smooth muscle actin, with positive cytoplasmic reactivity to S-100 protein (fig. 2d).