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Recurrent Mantle Cell Lymphoma Presenting as Gastrointestinal Bleeding.

Mantle cell lymphoma is a rare and aggressive subtype of B-cell non-Hodgkin lymphomas. Mantle cell lymphoma frequently involves extranodal sites, and gastrointestinal tract is involved microscopically and macroscopically in more than 80$ of cases. We present two cases of recurrent mantle cell lymphoma presenting with lower and upper gastrointestinal bleeding, respectively. A 58-year-old woman with a history of recurrent mantle cell lymphoma treated with chemotherapy and stem cell transplantation presented with left-sided abdominal pain and hematochezia. Colonoscopy showed a mass-like lesion in the ascending colon, polyps in the ascending colon, and splenic flexure. A 68-year-old man with a history of mantle cell lymphoma treated with chemotherapy presented with epigastric pain and melena. Esophagogastroduodenoscopy showed a large polypoidal ulcerated mass with oozing in the duodenal bulb. Biopsies in both patients were suggestive of mantle cell lymphoma. Patients with mantle cell lymphoma could be asymptomatic or may present with abdominal pain, obstruction, diarrhea, or gastrointestinal bleeding. In patients presenting with gastrointestinal symptoms, endoscopy must be pursued and biopsies must be taken for any suspicious lesions as well as normal mucosa to exclude mantle cell lymphoma as an etiology for the lesion or symptoms. Even though there are no standard guidelines for endoscopic screening of gastrointestinal tract in asymptomatic patients, one should be aware of involvement of gastrointestinal tract in the early course of disease or recurrent disease. Although mantle cell lymphoma is initially responsive to chemotherapy, it eventually becomes refractory with a median survival of 3-5 years.

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