Typical findings of a large bowel lymphoma include a circumferential, soft-tissue density mass that causes cavitation of the bowel (due to myenteric plexus infiltration) but without obstruction. Findings of more widespread disease make this case high yield for education and include cardiophrenic lymph nodes, soft tissue infiltration surrounding the left adrenal gland, bilateral renal infiltration (see liver window images), and omental/peritoneal disease (lymphomatosis). 

It is important to suggest lymphoma in the proper setting rather than have such a patient proceed to unnecessary surgery or partial colectomy, which is highlighted by the rapid response to chemotherapy in just two weeks.