PMC5948317_01
(A) Endoscopic colonoscopy showing a large polypoid lesion protruding into the entire lumen of the rectum. (B) Cap polyposis with characteristic surface blood vessels that are tortuous and dilated (white arrows).
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F1
The surface of the polyps showed tortuous and dilated small blood vessels (Figure 1).
Photomicroscopy showing a low-power light histopathology image of a benign polypoid colonic lesion with a fibrinous surface, or 'cap,' and surface ulceration, with superficial new vessels and mixed inflammatory cells. Hematoxylin and eosin (x100).
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F2
No malignancy or infectious organisms were identified. (Figure 2).
(A) Endoscopic colonoscopy showing a new polypoid lesion in the lower rectum with white exudate. (B) Endoscopic colonoscopy shows the appearance of the colonic mucosa following argon plasma coagulation of an area of cap polyposis presenting with small nodules.
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F3
Repeat polypectomy was performed using combined hot snare polypectomy and argon plasma coagulation to obliterate small mucosal nodules (Figure 3).
Follow-up endoscopic colonoscopy shows a rectal scar (white arrows). No recurrent polyps are identified.
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F4
Follow-up sigmoidoscopy showed a post-polypectomy rectal mucosal scar without recurrent polypoid lesions (Figure 4).