03 / Colorectal Surgery · laparoscopic

Low anterior resection with TME

Rectal cancer surgery is a dissection of one embryological package: the mesorectum comes out intact or the operation has failed, whatever the margins say.

Indication: Rectal cancer above the sphincters, usually after MDT-directed neoadjuvant therapy.

Part of Colorectal Surgery →4 stages4 complications to knowlaparoscopic

Read the imaging first

Practice before you scrub

The margin that writes the plan

A 61-year-old with rectal bleeding; colonoscopy found a rectal tumour. Staging MRI of the pelvis. (Fictional educational case.)

Rectal cancer is staged in millimetres: the tumour's distance from the mesorectal fascia decides whether surgery leads or follows radiotherapy.
The same envelope logic is the operation: TME removes the rectum inside an intact mesorectal package, and the pathologist grades the surgery by its surface.

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On the tray for this operation

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Stage

1 / 4

Vascular control

The inferior mesenteric artery is divided near its origin and the inferior mesenteric vein near the pancreas; the splenic flexure is often mobilised.

🔧 Maryland dissector 🔧 Clip applier

Watch for: Hypogastric nerve injury: bladder and sexual dysfunction · Left ureteric injury below the pedicle

Why are we operating?

Anterior resection with total mesorectal excision removes rectal cancer inside its intact mesorectal envelope, the operation that turned local recurrence from common to rare. Everything difficult about it follows from geography: the rectum lives in a bony pelvis surrounded by the nerves of continence and sexual function, and the margins are measured in millimetres on the pre-operative MRI.

Pulls toward surgery

Rectal cancer with clear predicted marginsPost-chemoradiotherapy resection of threatened-margin diseaseHeight above the sphincters permitting a joinFitness for a major pelvic operation

Gives the team pause

A threatened or breached mesorectal margin (radiotherapy first, not bravado)Sphincter involvement (a different operation, honestly named)Poor baseline continence making a join a bad giftFrailty against a long pelvic operation

Shared foundations

Embryological planes & mesenteric envelopes

The idea that made colorectal cancer surgery an oncologic discipline: the gut grew inside mesenteric envelopes, and dissecting the bloodless plane around an intact envelope removes the cancer with its lymphatic field. Total mesorectal excision is this idea applied to the rectum; every colonic resection is the same idea at a different address.

Understand it once, in the specialty hub

Stomas: formation, function, life

Half the specialty's operations create, protect or reverse a stoma: what they are for, how they differ, and what living with one asks of a patient.

Understand it once, in the specialty hub

What the surgeon is thinking

Vascular control
Why do the vessels come first, and why so high?
Dividing the inferior mesenteric artery near its origin harvests the nodal chain and frees the left colon to travel down for the join; the inferior mesenteric vein's separate division releases the last tether. The hypogastric nerve plexus lives millimetres behind the artery's origin, which is why 'high tie' is a precision phrase, not an enthusiasm.
Total mesorectal excision
What makes the TME plane 'holy'?
Between the mesorectal fascia and the pelvic sidewall lies an areolar plane that is bloodless when correct: staying in it keeps the envelope intact (the oncology) and keeps the dissection off the pelvic autonomic nerves (the function). Bleeding or nerve encounters are the plane announcing you have left it.
Distal division
What does the distal division actually certify?
A clear distal margin below the tumour, confirmed rather than presumed, on a rectum divided with as few stapler firings as the pelvis allows, since multiple crossing staple lines are a known leak risk. The pelvis's depth is why this is often the operation's hardest single move.
Anastomosis and defunctioning
Why test the join, and why defunction it?
The air-leak test interrogates the circular-stapled join while repair is still cheap. The loop ileostomy then changes what a leak would mean: not prevented, defanged, converting pelvic sepsis into a contained problem, which for a low, irradiated join is insurance worth its months.

Decision points

Defunctioning ileostomy for this join or not?
- Defunction
  Low join, irradiated field, difficult pelvis, imperfect air test or frail patient: any of these buys the stoma its place.
- No stoma
  High, well-perfused, untested-by-radiotherapy joins in fit patients: a calculated exposure with the patient in on the calculation.
The ileostomy does not stop leaks, it changes their price: the decision is an insurance assessment made with the join in front of you, and the counselling for it happened in clinic, not in recovery.
The tumour is lower than the MRI suggested and a clear margin may not leave a join-able rectum.
- Proceed to ultra-low join / coloanal
  Where a clear margin and the sphincters both survive: function honestly counselled, since the low anterior resection syndrome is real.
- Abdominoperineal excision
  When the margin requires the sphincters: a permanent colostomy is a better outcome than a positive margin with a join.
The margin outranks the join: no anastomosis is worth recurrent pelvic cancer. The operation's honest name is decided by tumour height, and the hardest version of this conversation happens before theatre, with the possibility named.

Leaving the OR

The handoff

Procedure: Low anterior resection with TME, stapled colorectal anastomosis, loop ileostomy
Margins: Distal margin clear on table; specimen envelope intact to the pathologist
Pelvis: Pelvic drain in; nerves identified and preserved bilaterally
Stoma: Loop ileostomy sited as marked, spouted, pink
Watch for: Stoma output and colour, day 5-7 pelvic sepsis window, urinary function on catheter removal

A fictional educational patient, handed over the way real ones are.

The postoperative course

POD 0-1Enhanced recovery with the stoma team's first visit: the patient's relationship with the ileostomy starts today.
POD 2-4Stoma working and its output watched (high output dehydrates); catheter out with a genuine eye on retention after pelvic dissection.
POD 5-7The leak window, read through the defunctioned lens: pelvic pain, fever or a rising CRP still means imaging, stoma or no stoma.
Weeks to monthsHistology to MDT; ileostomy reversal after imaging confirms a healed join; and honest follow-up of function, since the low join changes bowel habit for most.

Watch it done

Low anterior resection: surgical management of rectal cancer
The University of Toronto atlas explaining the resection, the mesorectal plane and the anastomosis.
Source: TVASurg, Toronto Video Atlas of Surgery · Watch on YouTube

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What can go wrong

Anastomotic leak Postoperative bleeding Postoperative ileus Venous thromboembolism

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