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

<div>(a) Colonoscopy identifies edematous stenotic lesion spreading over the entire circumference in the rectum at 10–18 cm from the anal verge. (b) Chromoendoscopy using indigo carmine was performed.</div>

Case Reports in Medicine

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Figure 2: Primary Signet Ring Cell Carcinoma of Rectum Diagnosed by Boring Biopsy in Combination with Endoscopic Mucosal Resection 