Conversation: The conversation between human and AI assistant.
[|Human|] Frank, a 72-year-old man with suspected colon cancer, underwent a colonoscopy. A large mass was found 12 centimeters proximal to the splenic flexure. In which part of the colon is this located? Trace the route of the colonoscope to the location of the mass.
[|AI|]  Thanks for your question on Chat Doctor. In my opinion you should get done CT abdomen to locate exact position of mass. By your description I think you have bowel mass in terminal transverse colon or starting of descending colon. You need biopsy for the diagnosis of tumor type. And treatment is based on type of tumor and spread of tumor. So get done PET SCAN to rule out distal metastases.  If distal metastases are present than only chemotherapy is indicated. But if absence of distal metastases than you can get done unblock dissection of tumor (complete removal) and post-operative chemotherapy. So biopsy is must.