Polypectomy is a common endoscopic procedure used to remove abnormal growths called polyps from the lining of the gastrointestinal (GI) tract. These polyps are usually benign, but some can develop into cancer if left untreated. Standard polypectomy techniques are sufficient for small or easily accessible polyps; however, more complex, larger, or flat lesions often require advanced endoscopic polypectomy.
Advanced endoscopic polypectomy has become a preferred, minimally invasive alternative to surgery for the removal of challenging polyps. This article explores when the procedure is needed, how it works, the differences between advanced and standard techniques, as well as the benefits, limitations, and alternatives.
Get An Appointment With A Colorectal Surgeon
Back To: Colorectal Cancer & Other Conditions Main Page
What Is An Advanced Endoscopic Polypectomy?
An advanced endoscopic polypectomy is a specialised endoscopic technique designed to remove large, flat, or complex polyps that cannot be managed safely with conventional methods. Unlike standard polypectomy, which simply snips off a polyp using a wire loop called a snare, advanced techniques involve a more precise and layered approach to ensure complete removal while preserving surrounding healthy tissue.
These procedures are performed using a flexible endoscope. The endoscope is a long, slender tube fitted with a high-definition camera and specialised surgical tools. The two main types of advanced endoscopic polypectomy are Endoscopic Mucosal Resection (EMR) and Endoscopic Submucosal Dissection (ESD).
What Is Endoscopic Mucosal Resection (EMR)?
Endoscopic Mucosal Resection (EMR) is a technique used to remove larger or flatter lesions that lie within the mucosal layer — the innermost lining of the gastrointestinal tract.
The procedure typically involves these steps:
- Injection: A liquid solution (such as saline mixed with dye) is injected underneath the polyp to lift it away from the deeper tissue layers.
- Snaring: Once lifted, the lesion is captured with a snare — a thin, wire-like loop — and removed using electrocautery (heat energy).
- Retrieval: The removed tissue is retrieved for histological analysis to confirm whether it is benign, precancerous, or malignant.
EMR is highly effective for polyps that are slightly raised or flat but still limited to the mucosal layer. It is minimally invasive and has a low risk of complications when performed by an experienced endoscopist.
What Is Endoscopic Submucosal Dissection (ESD)?
Endoscopic Submucosal Dissection (ESD) is a more advanced and technically demanding procedure, used for larger, deeper, or more complex lesions that extend into the submucosal layer (just beneath the mucosa).
The process involves:
- Marking: The area around the lesion is marked using a special electrocautery knife.
- Injection: A lifting solution is injected to separate the lesion from the underlying muscle layer.
- Dissection: Using fine, knife-like instruments, the endoscopist carefully dissects the tissue beneath the lesion, freeing it completely in one piece — a process known as en bloc resection.
Unlike EMR, which often removes polyps in several smaller pieces, ESD allows for the entire lesion to be excised in a single specimen. This improves the accuracy of pathological assessment and reduces the likelihood of recurrence. However, ESD takes longer to perform and requires advanced technical expertise.
How Are EMR And ESD Different From Standard Polypectomy?
Standard polypectomy is usually performed for small, stalked (pedunculated) polyps. The endoscopist loops a snare around the base of the polyp and removes it using electric current. While this is effective for simple cases, it may not ensure complete removal of large or flat lesions.
In contrast, EMR and ESD offer greater precision and control:
- Depth of removal: EMR targets the mucosa, while ESD reaches the submucosal layer.
- Completeness: ESD removes lesions in one piece, while standard polypectomy may fragment the tissue.
- Applicability: Advanced techniques are suitable for larger, irregular, or high-risk polyps that might otherwise need surgery.
- Recurrence risk: Lower after ESD compared to standard methods, due to more thorough removal.
Both EMR and ESD significantly expand what can be achieved with endoscopy, often eliminating the need for open surgery.
When Is Advanced Endoscopic Polypectomy Needed?
Advanced endoscopic polypectomy is typically recommended in the following situations:
- Large polyps (over 2 cm): Too big for standard snare removal.
- Flat or sessile lesions: Those without a stalk, which are difficult to grasp.
- Polyps in challenging locations: Such as bends in the colon or near the rectum.
- Recurrent lesions: After incomplete removal during a previous procedure.
- Early-stage cancers: Confined to the mucosal or submucosal layer and suitable for curative resection.
By addressing such cases through endoscopy rather than open surgery, patients benefit from less pain, fewer complications, and faster recovery.
What Are The Benefits Of Advanced Endoscopic Polypectomy?
- Minimally invasive: No external cuts or stitches.
- Faster recovery: Most patients can return home the same day.
- Lower complication rates: Less bleeding and infection compared to surgery.
- Organ preservation: The structure and function of the GI tract are maintained.
- Accurate diagnosis: Larger tissue samples can be analysed thoroughly for signs of cancer.
This makes advanced endoscopic polypectomy one of the safest and most efficient ways to manage complex gastrointestinal polyps in modern medicine.
What Are The Risks Or Limitations?
While generally safe, potential risks include:
- Bleeding: Particularly after removal of large or flat lesions.
- Perforation: A rare but possible tear in the intestinal wall.
- Incomplete removal: Some complex polyps may need a repeat procedure or surgery.
- Post-polypectomy discomfort: Temporary bloating or mild abdominal pain.
What Are The Alternatives To Advanced Endoscopic Polypectomy?
Depending on the polyp’s characteristics, alternatives may include:
- Standard polypectomy: For smaller, pedunculated polyps.
- Surgical resection: For deeply invasive or malignant growths.
- Surveillance: Regular endoscopic monitoring for low-risk lesions.
- Ablative therapy: Such as argon plasma coagulation to remove residual tissue.
Frequently Asked Questions (FAQs)
No. Sedation or anaesthesia is used to ensure comfort throughout the procedure. Some patients may feel mild bloating or abdominal discomfort afterwards, which usually resolves quickly.
Most patients recover within 24–48 hours and can return to normal activities soon after. Doctors usually advise rest and light meals for the first day.
If the removed tissue shows signs of cancer, further evaluation will determine whether additional treatment, such as surgery or chemotherapy, is needed.
Get An Appointment With A Specialist
Advanced endoscopic polypectomy offers a safe, minimally invasive, and highly effective alternative to surgery. Patients can benefit from excellent outcomes and faster recovery.
Back To: Colorectal Cancer & Other Conditions Main Page
This medical content has been reviewed by Dr Lee Kuok Chung, a highly experienced colorectal surgeon specialising in minimally invasive and robotic surgery for colorectal cancer and complex perianal conditions. He is also one of the few surgeons in Singapore skilled in advanced endoscopic techniques such as EMR and ESD, allowing large polyps and early cancers to be removed without major surgery.
Click for content in Simplified Chinese, Bahasa Indonesia, and Vietnamese.
Protect against cancer, cardiovascular disease, and other chronic diseases with regular health screening. Compare and shop for health screenings from Singapore and regional healthcare providers at a single convenient platform - health365.asia.
This article is informative only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment, and should never be relied upon for specific medical advice.