PMC7184855_01
Colonoscopy. a A flat-elevated lesion presenting as a dome-shaped double elevation in the ascending colon. b Chromoendoscopy with indigo carmine showing the border of the lesion. c Narrow-band imaging showed irregular vessel patterns in the lesion. d A histological examination revealed the lesion to be a well-differentiated type (tub1) tubular adenocarcinoma (scale bar, 200 mum).
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F1
Screening CS was performed on a 55-year-old man, which revealed a flat-elevated lesion presenting as a dome-shaped double elevation in the ascending colon (Fig. 1a, b). Magnifying endoscopy with narrow-band imaging showed irregular vessel patterns in the lesion (Fig. 1c). In endoscopic mucosal resection performed after hemostasis, the resected specimen was a 12 x 10 mm lesion, which a histological examination confirmed as well-differentiated type (tub1) tubular adenocarcinoma with a negative margin (Fig. 1d).
Colonoscopy and CT. a Multiple diverticula and coagula were observed in the sigmoid colon. b Hemostatic clipping was performed. c CT revealed multiple diverticula in the sigmoid colon.
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F2
CS revealed bleeding from multiple sigmoid diverticula (Fig. 2a), on which hemostatic clipping was subsequently performed (Fig. 2b). CT revealed multiple diverticula in the sigmoid colon (Fig. 2c).
Resected specimen and histopathologic examination. a Multiple sigmoid diverticula were recognized. b Bleeding was observed in sections 1-2 and 4-6 of the diverticulum. c Bleeding was shown to be present in sections 1-2 of the diverticulum (scale bar, 100 mum). d Diverticulitis with severe chronic inflammatory cell infiltration was shown to be present in sections 3-4 of the diverticulum (scale bar, 100 mum).
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F3
The resected specimen revealed multiple sigmoid diverticula with bleeding (Fig. 3a, b). Again, a histological examination showed bleeding in the diverticulum (Fig. 3c) and diverticulitis with severe chronic inflammatory cell infiltration (Fig. 3d).