Intramocusal andenocarcinoma on rectum.

Hello Doctor. I had intramucosal adenocarcinoma of the rectum about 9 years ago, arising from a 2 × 2 cm tubulovillous adenoma, moderately differentiated, with no invasion beyond the muscularis mucosa. Only polypectomy was performed, and no further treatment was required. The report showed MSI-negative / MMR-proficient. At that time, MRI of the pelvis and a CT scan were normal, and the post-polypectomy site biopsy showed no dysplasia or malignancy. Follow-up has been done regularly: • Colonoscopy – about 10 times, all normal (last on 12 November 2025) • Whole abdomen ultrasound – about 10 times, all normal • Blood tests – about 6 times, all normal • Chest X-ray (PA view) – 4 times, all normal Kindly advise the appropriate interval for my future surveillance colonoscopy. Also, if a new polyp appears in the future, would it necessarily be malignant in my case, or would it usually be benign? If I undergo colonoscopy every year, what is the risk that a new polyp could be malignancy?