Synchronous adenocarcinoma and marginal zone B-cell lymphoma of the colon: a case report

Synchronous development of a colonic adenocarcinoma and lymphoma is extremely rare, with only a few cases reported in the literature. We report a case of a marginal zone B-cell lymphoma, which was incidentally diagnosed in a colonic resection for adenocarcinoma in a 77-year-old woman. It is important to be aware of the association, so as not to regard all lymphoid infiltrates surrounding a carcinoma as being reactive in nature.