Coexisting tubular adenoma with a neuroendocrine carcinoma of colon allowing early surgical intervention and implicating a shared stem cell origin

Figure 1 A 68-year-old male undergoing a routine colonoscopy was found to have multiple tubular adenomas measuring 5-8 mm. A: The endoscopic picture shows an ulcerated non-circumferential medium-sized slighted raised polyp/lesion (arrow and circle) in the ascending colon measuring 0.3 cm in diameter; B: Gross picture of the specimen with the ascending colon showing an ulcerating mass with raised borders and clear resection and radial margins.