Improving Radical Treatment Through MRI Evaluation of Pelvic Sigmoid Cancers

This study is evaluating whether using detailed MRI scans to assess sigmoid colon cancer (a cancer in the lower part of the large intestine) before surgery can improve surgical planning and help doctors decide whether patients should receive chemotherapy or radiation before their operation. **You may be eligible if...** - You are 16 or older - You have a suspected or confirmed sigmoid colon cancer - You are eligible for surgery intended to cure the cancer - The cancer has not spread to other parts of the body (no metastatic disease) - You have not yet had a final treatment decision made - You have signed an informed consent form **You may NOT be eligible if...** - Your cancer has spread to other organs (including resectable liver metastases) - You have a second cancer at the same time - You cannot have an MRI scan (e.g., due to a pacemaker or metal implants) - You have an allergy to Buscopan (an antispasmodic medication used during the MRI) - You have severe health problems that prevent chemotherapy or radiation if needed Talk to your doctor to see if this trial is right for you.