PMC5463671_01
Ascending colon mass with hematoxylin and eosin (H&E) staining. (a) Low power view showing abrupt transition from colon mucosa to benign squamous mucosa, suggesting ectopic esophageal tissue in the right colon (5x). (b) Well-differentiated keratinizing SCC next to colonic glandular mucosa in the right colon (10x).
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F0001
Histologically, there was benign squamous mucosa with patterns suggestive of esophageal tissue and staged IIa invasive SCC (Figure 1).
PMC5463671_02
Colonoscopy showing a non-obstructing 6 cm hepatic flexure friable and ulcerating mass without any visible synchronous lesions.
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F0002
EGD was unremarkable, but colonoscopy identified mass in the hepatic flexure (Figure 2).