A Case of Mucosa-Associated Lymphoid Tissue Lymphoma of the Sigmoid Colon Presenting as a Semipedunculated Polyp

• Published in: Clinical endoscopy Vol. 47; no. 2; pp. 192 - 196
• Main Authors: Kim, Myung Hwan, Jung, Jin Tae, Kim, Eui Jung, Kim, Tae Won, Kim, Seon Young, Kwon, Joong Goo, Kim, Eun Young, Sung, Woo Jung
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Society of Gastrointestinal Endoscopy 01.03.2014; 대한소화기내시경학회
• Subjects: Case Report; 내과학; Sigmoid colon; Mucosa-associated lymphoid tissue lymphoma; Colonic polyps
• ISSN: 2234-2400; 2234-2443
• DOI: 10.5946/ce.2014.47.2.192

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.