Collision tumor of carcinoma and lymphoma in the cecum: case report and review of literature.

Collision tumors that occur in the gastrointestinal tract, especially the intestine, are rare, and collisions of carcinoma and lymphoma are even more rare. We report a case of collision tumor with adenocarcinoma and non-Hodgkin's diffuse large B-cell lymphoma in the cecum of an elderly male patient. Literature was reviewed to explore the clinicopathologic features, differential diagnosis, treatment, and prognosis of collision tumors with carcinoma and lymphoma involving the gastrointestinal tract, to enhance the understanding of this rare tumor, and improve diagnosis and treatment. IJCEP