What could be the probable diagnosis of a growth at sigmoid colon and rectm junction?

Growth=Polyp=Tumor: A growth in the colon, also called a polyp, is a tumor or growth of abnormal tissue. They can be benign (non-cancerous) or cancer. Benign polyps such as adenomas have potential to turn to cancer if they grow a long time. Other polyps, such as hyperplastic, usually don't turn to cancer. Some polyps may already have cancer in them. Colonoscopy with biopsy is usually needed to make a diagnosis.

Depends: If small and associated with polyp most probably an adenoma. But this needs clipping out as it can eventually turn malignant. If larger and visually suspicious then most likely adenocarcinoma (cancer). Either way any growth in this area needs removal then recommendation can be made based on the pathology results.

Could be cancer: There are number of possibilities including crohn's disease and ulcerative colitis. A large precancerous polyp is conceivable, low grade malignancies (cancers) such as carcinoid tumors and lymphoma occur in that location, but the most likely finding is adenocarcinoma. The prognosis will be based on surgical findings and pathology, as well as additional studies, like a ct or pet scan.