Primary Signet Ring Cell Carcinoma of Rectum Diagnosed by Boring Biopsy in Combination with Endoscopic Mucosal Resection

Figure 3

(a) Miniprobe ultrasound shows diffuse thickening of the rectal wall without destruction of a 5-layer structure. (b–d) Endoscopic mucosal resection was performed with a conventional electrosurgical snare to remove the edematous thick mucosa, followed by boring biopsies from the resected area (arrow) to obtain deeper specimens.

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