Primary Low-grade Lymphoma of the Rectum in an Asymptomatic Patient A CASE TO REMEMBER

Primary lymphoma of the colon is relatively uncommon. Most studies report lymphomas comprising of only 1%–4% of malignant neoplasms in the gastrointestinal (GI) tract. Although the GI tract is the most common extranodal location for the development of non-Hodgkin lymphoma (NHL), in adults only 10%–20% of the primary GI lymphomas occur in the colon. All reported cases of primary rectal lymphoma have been associated with GI symptoms. We report an asymptomatic patient with rectal polyps, which on pathologic examination was diagnosed as low-grade B-cell follicular lymphoma.