01
A dedicated rectal MRI
Tumour height from the anal verge, relationship to the levators, mesorectal fascia involvement and nodal status. This scan makes the decision — a CT scan cannot.
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Sphincter-preserving rectal surgery
For low rectal cancer, the first question is not whether surgery is possible — it is whether a permanent stoma can honestly be avoided.
Dr. Ritesh Anand · MBBS, MS (General Surgery), MCh (Surgical Gastroenterology) · Smiles Institute of Gastroenterology, Mathikere, Bengaluru · Reviewed 30 August 2026
At a glance
- Decided by
- Pelvic MRI, tumour height, sphincter function
- Options
- Low anterior resection, intersphincteric resection, local excision
- Temporary stoma
- Often, to protect the join — with a reversal plan and a date
- Reversal
- Usually 8–12 weeks, after imaging confirms healing
- Honest caveat
- Not every tumour can be resected with the sphincter preserved
Who this is for
- Low or mid rectal cancer where a permanent stoma has been proposed elsewhere
- Patients told 'the anus will have to be removed' who want a second read of the MRI
- Good baseline sphincter function and a tumour that responded to chemoradiotherapy
- Selected early rectal tumours suitable for local excision or watch-and-wait protocols
For most patients, the fear is not the cancer word — it is the bag. Modern rectal surgery can often preserve the sphincter where an older approach would not have. But preservation is only worth doing when the cancer clearance is uncompromised and the function afterwards is liveable. You deserve both facts before you decide, including the one where preservation is the wrong answer.
What actually happens, step by step.
02
Neoadjuvant therapy where it helps
Chemoradiotherapy can shrink and downstage a tumour away from the sphincter complex, turning an impossible case into a preservable one.
03
Function assessed before, not assumed
If your continence is already poor, a preserved but non-functioning sphincter is not a win. This is discussed candidly.
04
The operation
Total mesorectal excision with a low or intersphincteric anastomosis, usually protected by a temporary loop ileostomy.
05
Reversal and rehabilitation
The temporary stoma is reversed with a date and a plan. Bowel-function rehabilitation, including for low anterior resection syndrome, is part of the follow-up.
Recovery, honestly
- Frequent, urgent, fragmented stools in the early months after a low join — this is low anterior resection syndrome and it usually improves.
- Diet, timing, fibre agents and pelvic-floor work are used deliberately, not left to chance.
- Temporary stoma care taught before discharge, with a stoma nurse contact.
- Function is reviewed at every follow-up, alongside cancer surveillance.
Risks and limits
- Anastomotic leak, higher for very low joins — the reason for a protecting stoma.
- Persistent bowel dysfunction in a minority of patients.
- A temporary stoma that, for medical reasons, cannot safely be reversed.
- Preservation being unsafe once the pelvis is assessed — the plan is explained to you before you consent to either outcome.
No outcome, cure rate or survival figure is promised on this page. Any clinician who promises one should be questioned.
Bring these to your appointment
Questions worth asking any surgeon — including me.
- 01How far is my tumour from the anal verge on MRI?
- 02Would chemoradiotherapy improve my chance of keeping the sphincter?
- 03If I need a stoma, is it temporary or permanent — and what is the reversal plan?
- 04What will my bowel function realistically be like at six months?
Common questions
Can rectal cancer be treated without a permanent colostomy?
Often, yes. Tumour height on MRI, response to chemoradiotherapy and your existing sphincter function decide it. Many patients need a temporary stoma that is later reversed, which is different from a permanent one.
What is low anterior resection syndrome?
A cluster of bowel symptoms after a low rectal join — urgency, frequency, fragmentation and incomplete emptying. It usually improves over the first year with diet, medication and pelvic-floor rehabilitation.
I was told I need a permanent stoma. Is a second opinion reasonable?
Entirely reasonable, and no good surgeon takes offence. Send the colonoscopy report, biopsy and pelvic MRI for a written second opinion before you consent.
Next step
Send your reports first. The appointment then starts further ahead.
Colonoscopy report, biopsy, scans and any plan you have already been given. A written second opinion costs nothing and carries no obligation to change doctors.
This page is general information reviewed by Dr. Ritesh Anand, MBBS, MS (General Surgery), MCh (Surgical Gastroenterology). It does not replace a consultation. For heavy bleeding, severe pain or an inability to pass stool or gas, go to the nearest emergency department.
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