MSFinals-0701

A 60-year-old bus driver is referred by his general practitioner with a change in bowel habit and bleeding per rectum. He reports no further symptoms, and an abdominal and digital rectal examination are unremarkable. However, colonoscopy shows a high rectal tumour, encompassing approximately two-thirds of the diameter of the colon. He is booked to have an operation.
Which of the following is he most likely to be listed for?