PMC5836183_01
A T1 cancer 4 mm in diameter at the rectum. a White light observation showed a reddish and diminutive polyp 4 mm in size. b Narrow-band imaging showed irregular vessel and surface patterns. JNET 2B. c Partial protrusions within the cold snare polypectomy mucosal defect were detected.
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F1
A reddish and diminutive polyp 4 mm in size was detected at the rectum (Fig. 1a). NBI with magnification showed irregular vessels and surface patterns (Fig. 1b). The polyp was thoroughly resected, though the snare was stuck during resection and partial protrusions within the CSP mucosal defect were detected (Fig. 1c).
Histological examination showed a T1 cancer with a positive vertical and horizontal margin.
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F2
T1 cancer with a positive vertical and horizontal margin (Fig. 2). There were no lymphovascular invasions on immunohistochemical examination.
Follow-up after cold snare polypectomy. a White light observation showed no recurrent findings. b Blue laser imaging showed no recurrent findings. c Endoscopic submucosal dissection was performed on the scar area, and the histological examination showed no remaining tumors.
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F3
However, there was the possibility of a remnant tumor in the submucosa, and thus endoscopic submucosal dissection was performed on the scar area for local cure (Fig. 3).