adenomatous cells in colon without polyps

My 66 year old mother has been having bowel problems for around 12 years. She has been diagnosed with diverticulitis and stomach adhesions. Over the last couple of years her problems, including diarrhea and pain on her right side, have worsened considerably. She has had colonoscopies which are very difficult for her for some reason, and once they were only able to do the procedure by using a pediatric scope. Last year's colonoscopy revealed no polyps but adenomatous cells in the biopsy of tissue. This year, in a colonoscopy of her right colon again they found no polyps, but they took numerous samples to biopsy and found numerous adenomatous cells in all samples. Gastroenterologist has referred her to a surgeon. Are there any other avenues that should be explored before surgery? Could this be attenuated FAP? Any other possibilities? She just needs some ideas about steps to take. The Gastroenterologist didn't seem to know what to make of the results, but felt that she was at higher risk for cancer. Can you provide some direction?

Thank you,
Elizabeth