📍 Whitefield, Bengaluru
HOD & Senior Consultant · Surgical Oncology
Consultation by Appointment
What patients most often ask
Every operation and every patient is different. Your surgeon will explain whether a stoma is likely in your case.
Read the complete guide: Organ Preservation Surgery for Cancer: Treatment Options, Candidacy and Outcomes
Sphincter-preserving surgery removes rectal cancer while retaining the anal sphincter muscles, so that many patients can retain bowel continuity and avoid a permanent colostomy.
Using total mesorectal excision (TME), often robotic or laparoscopic, surgeons remove the rectum and surrounding lymph nodes and reconnect the bowel. Advances in radiation and chemotherapy have made sphincter preservation possible for many low rectal tumors.
The operation chosen depends mainly on how far the tumor is from the anal sphincter, as shown in the table below.
| Procedure | Tumor location | Outcome |
|---|---|---|
| Low anterior resection (LAR) | Upper and middle rectum | Bowel reconnected; temporary ileostomy sometimes used |
| Ultra-low anterior resection | Low rectum | Reconnection close to the anus; sphincter kept |
| Intersphincteric resection (ISR) | Very low rectum, above the sphincter | Part of internal sphincter removed; external sphincter kept |
| Abdominoperineal resection (APR) | Tumor invading the sphincter | Permanent colostomy; used when preservation is unsafe |
Watch and wait, also called non-operative management, is an organ-preservation strategy in which patients who achieve a complete clinical response after chemoradiation are monitored closely instead of having rectal surgery.
It is used after total neoadjuvant therapy (TNT), which combines chemotherapy and radiation before any surgery. Studies such as the OPRA trial reported that roughly 40 to 55 percent of selected patients kept their rectum without surgery, with oncologic outcomes reported as similar in selected cohorts. Tumor regrowth occurs in some patients, mostly within the first two years, and many regrowths can still be treated with surgery.
Close monitoring is what makes this approach possible. The table below shows a typical surveillance plan; your team will set the exact schedule.
| Test | Typical frequency | Purpose |
|---|---|---|
| Digital rectal exam and proctoscopy or flexible sigmoidoscopy | Every 3 to 4 months in the first 2 years | Detects local regrowth early |
| Pelvic MRI | About every 6 months for the first 2 to 3 years | Checks the tumor bed and pelvic lymph nodes |
| CEA blood test and CT of chest, abdomen, and pelvis | At intervals set by the care team | Monitors for distant spread |
Selected early rectal cancers can be removed through the anus with local excision techniques such as transanal endoscopic microsurgery (TEM) or TAMIS, without removing the rectum.
This is generally suited to small, low-risk T1 tumors without adverse features such as deep invasion, lymphovascular invasion, or poor differentiation. If pathology after removal shows high-risk features, further surgery may be recommended.
Most patients undergoing sphincter-preserving surgery do not need a permanent stoma, although a temporary ileostomy is often used for a few months while the bowel connection heals.
Some patients develop low anterior resection syndrome (LARS), which usually improves over 6 to 24 months. Symptoms may include:
Management may include dietary changes, fiber, anti-diarrheal medicine, pelvic floor physiotherapy and biofeedback, and transanal irrigation for persistent symptoms.
