I had a colonoscopy that detected a 2.5 cm mass in the cecum. They said the biopsy was benign. The nurse practitioner told me if I were her sister she would recommend it be removed. I chose to have the surgery at Mayo. They wanted to know if I had a PET scan. I told them no so my provider ordered one. The CT portion of the exam was benign. The PET portion showed the mass was cancer. The surgery was done robotically. It wasn't fun, but no complications. So I go every year for a colonoscopy. Sorry to hear your surgery was awful.