Associate Director & Unit Head, Surgical Oncology, Max Hospital, Gurgaon
Part 4 of 10 in Diagnosis and Management of Rectum Cancer
Sphincter-Preserving Surgery for Low Rectal Cancer
September 5, 2026
Many patients fear that rectal cancer surgery means permanently losing normal bowel function. For most patients today, that no longer has to be the outcome.
How Rectal Cancer Actually Spreads
Rectal cancer follows its natural embryological lymphatic and vascular supply, spreading upward rather than downward. Recognising this allows surgeons to stay strictly within an anatomical plane, the mesorectal fascia, and remove the tumour completely along with its draining lymph nodes while achieving a clear margin.
Preserving Normal Passage Even in Low Tumours
By dissecting sharply between the internal and external anal sphincter, an intersphincteric resection can achieve a clear margin as small as one centimetre at the lowest point of the tumour, even when the cancer lies very low in the rectum. This makes a normal bowel passage possible for most patients rather than a permanent stoma.
Confirming a Clear Margin Without Frozen Section
Where intraoperative frozen section pathology isn't available, following the natural avascular surgical plane and taking a margin of about one centimetre at the lowest extent of the tumour, or three to five centimetres higher up depending on tumour location, allows the surgeon to proceed with confidence, with the final histopathology report confirming margin status afterward.
A Temporary Stoma, Not a Permanent One
Most patients who undergo intersphincteric resection need only a temporary stoma, typically for around three months, which is then reversed once healing is complete.
← The Diagnostic Workup for Colon and Rectum Cancer: Tests, Scans and Staging | Series index | Complete Mesocolic Excision with Central Vascular Ligation for Colon Cancer →
This article is based on a Jivo Masterclass session conducted by Dr. Kaushal Kishore Yadav, Associate Director & Unit Head, Surgical Oncology, Max Hospital, Gurgaon, India. The article has been summarised with the assistance of an AI tool from the original masterclass recording. Watch the full Masterclass recording
This guide is based on a live Jivo Masterclass: Dr. Kaushal Kishore Yadav taught doctors across Africa on June 15, 2025.
FROM THE LIVE Q&A
Dr. Yagaram
Asked whether sphincter-preserving surgery (intersphincteric resection) can really be done even for a distal rectal cancer, one lying very low in the rectum.
Dr. Kaushal Kishore Yadav
Yes. Rectal cancer spreads upward along its natural embryological lymphatic supply rather than downward, so staying strictly within that anatomical plane allows the tumour to be removed completely, following guidelines that show even a minimal distal margin of one centimetre is adequate. An intraoperative frozen section can confirm all microscopic cancer cells have been cleared, and this makes it possible to go between the internal and external anal sphincter even for the lowest-lying tumours, preserving a normal passage instead of requiring a permanent stoma.
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Frequently Asked Questions
Followed up: in a setup where frozen section pathology is not available, how can a surgeon be confident of a clear margin, and how should the patient be followed afterward?▼
Follow the natural avascular surgical plane, doing sharp dissection between the internal and external sphincter. On gross examination, aim for about one centimetre of margin at the lowest extent of the tumour, or three to five centimetres higher up depending on where the tumour is located. Stay within the correct surgical plane and the margin should come back clear; the final histopathology report, once it arrives, confirms this.
Working in a region with very limited healthcare infrastructure, asked what to do when none of the described tests (MRI, CT, PET-CT, tumour markers) are available locally.▼
Do whatever is genuinely achievable under your own control. If something cannot be done locally, it is better to refer the patient to a centre where it can be done with precision, because cancer gives only one real chance to get the treatment pathway right.
Asked Dr. Yadav to clarify the name of the surgical technique he had just described for colon cancer.▼
It is called complete mesocolic excision with central vascular ligation, sometimes shortened to CME with CVL. The feeding blood vessels of the tumour are ligated right at their origin so that all the draining lymph nodes and the complete mesocolic fascia are removed together; this has been published in international journals and is associated with better survival than the standard technique.
Relayed a case: a patient with sigmoid colon cancer who has liver metastases only. How should a case like this be managed?▼
If the liver metastases are limited, roughly one to three, and can be completely removed, liver metastasectomy can be done at the time of the primary surgery or as a second stage. If the liver is diffusely involved in both lobes, there is no role for curative surgery and only palliative chemotherapy is appropriate. If instead there is peritoneal-only spread with no other site involved, cytoreductive surgery combined with HIPEC gives a survival advantage of about fifty percent in colorectal cancer, provided the disease is limited and combined with chemotherapy before and after.
Explained what an online OPD is, for doctors wanting to bring a relevant patient to Dr. Yadav.▼
When a Jivo doctor partner has a relevant patient, they collect the case details and share the information with the Jivo team in advance. The patient is invited to the partner doctor's own clinic, where Dr. Yadav then joins the consultation by video call, so the consultation is guided jointly by doctors in both India and Africa.
Does rectal cancer always require a permanent stoma?▼
No. Because rectal cancer spreads upward rather than downward along its embryological lymphatic supply, sphincter-preserving surgery can remove even very low tumours while preserving a normal bowel passage.
What margin is needed for sphincter-preserving rectal cancer surgery?▼
A margin as small as one centimetre at the lowest point of the tumour is adequate when the correct anatomical plane is followed, confirmed afterward by the final histopathology report.
How long does a temporary stoma stay in place after this surgery?▼
Typically around three months, after which it is reversed once healing is complete.
In This Series: Diagnosis and Management of Rectum Cancer
- 1.Diagnosis and Management of Rectum Cancer
- 2.Warning Signs and Risk Factors for Colorectal Cancer
- 3.The Diagnostic Workup for Colon and Rectum Cancer: Tests, Scans and Staging
- 4.Sphincter-Preserving Surgery for Low Rectal Cancer
- 5.Complete Mesocolic Excision with Central Vascular Ligation for Colon Cancer
- 6.Open, Laparoscopic and Robotic Surgery for Colon and Rectum Cancer
- 7.Managing Stage 4 Colorectal Cancer: Liver and Peritoneal Metastases
- 8.When Is Chemotherapy or Radiotherapy Needed Before Rectal Cancer Surgery?
- 9.Colorectal Cancer Screening: Who Should Get Tested and When
- 10.Referring a Colorectal Cancer Patient for Treatment in India