Inflammatory Bowel Disease — Surgical Aspects — Practice

A 65-year-old male presents with a 6-month history of change in bowel habits, mucus in stools, and lower abdominal discomfort. Colonoscopy reveals a circumferential mass at the rectosigmoid junction. Biopsy confirms adenocarcinoma. CECT and MRI show the tumour confined to the bowel wall without nodal or distant metastasis (T2N0M0). The most appropriate surgical management is: