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KMID : 1038120140470020192
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Clinical Endoscopy
2014 Volume.47 No. 2 p.192 ~ p.196
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A Case of Mucosa-Associated Lymphoid Tissue Lymphoma of the Sigmoid Colon Presenting as a Semipedunculated Polyp
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Kim Myung-Hwan
Jung Jin-Tae
Kim Eui-Jung
Kim Tae-Won
Kim Seon-Young
Kwon Joong-Goo
Kim Eun-Young
Sung Woo-Jung
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Abstract
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Mucosa-associated lymphoid tissue (MALT) lymphomas are characterized by lymphoepithelial lesions pathologically. Colonic MALT lymphomas are relatively rarer than lymphomas of the stomach or small intestine. Endoscopically, colonic MALT lymphoma frequently appears as a nonpedunculated protruding polypoid mass and/or an ulceration in the cecum and/or rectum. We report a unique case of a colonic MALT lymphoma presenting as a semipedunculated polyp. A 54-year-old man was found to have a 2-cm semipedunculated polyp in the sigmoid colon during screening colonoscopy. The polyp was removed by endoscopic mucosal resection. Histologic examination of the resected polyp revealed diffuse epithelial infiltration by discrete aggregates of lymphoma cells. We diagnosed the tumor as low-grade B-cell MALT lymphoma by immunohistochemical staining.
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KEYWORD
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Mucosa-associated lymphoid tissue lymphoma, Sigmoid colon, Colonic polyps
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