What the operation involves
Dissection follows the mesorectal fascia to the pelvic floor, keeping the specimen envelope intact — the strongest surgical predictor of local control in rectal cancer. The hypogastric and pelvic autonomic nerves are identified and preserved to protect bladder and sexual function, and the colon is joined to the low rectum or anal canal.
- Intact mesorectal envelope with negative circumferential margin
- Nerve-sparing pelvic dissection
- Diverting loop ileostomy where the join is very low or after radiotherapy
Where it fits in the pathway
Most locally advanced rectal cancers receive chemoradiotherapy or total neoadjuvant therapy first, with surgery 8–12 weeks later after MRI restaging. Early tumours may proceed straight to surgery.
Function afterwards
Urgency and frequency are common for six to twelve months (low anterior resection syndrome) and improve with pelvic floor rehabilitation, diet modification and medication. Expected function is discussed before consent.
Common questions
- When is the ileostomy reversed?
- Usually 8–12 weeks after surgery, once a contrast study confirms the join has healed and any chemotherapy schedule allows.
- Why is robotic access useful in the pelvis?
- The pelvis is narrow and fixed; articulated instruments and a stable 3D view make the lowest part of the dissection more controlled, with fewer conversions to open surgery in published series.
Related reading
This page is general education, reviewed by Dr. Ishaan Allahabadi, MCh Surgical Oncology (Edge Hill, UK) · MS Surgery · MBBS (Accredited by the Royal College of Surgeons of England). It is not a substitute for individual medical advice. Treatment decisions are made after reviewing your imaging and pathology, in a multidisciplinary tumour board.