Polypectomy: How Your Polyps Are Removed

Polypectomy—the endoscopic removal of a polyp—is the primary tool for preventing colon cancer. During your colonoscopy, your doctor doesn’t just “see” polyps; they must choose the safest and most effective tool to remove them entirely. This choice is guided by international standards from organizations like the American Society for Gastrointestinal Endoscopy (ASGE) and the European Society of Gastrointestinal Endoscopy (ESGE) ^[1][2].

The Right Tool for the Job: Individualized Strategies

The size of a polyp is one of the most important factors in deciding which removal technique to use, but the choice is also based on morphology, whether it is pedunculated (on a stalk), its location, and the operator’s expertise.

• Small Polyps (under 10mm): For these tiny growths, doctors usually use Cold Snare Polypectomy (CSP). A wire loop (snare) is placed around the polyp and closed to “cheese-wire” through the tissue without using heat. This is considered the safest method for small polyps because it avoids the risk of heat-related injury to the colon wall ^[1][3].
• Medium Polyps (10mm to 19mm): These may be removed using cold snare, or they may require Hot Snare Polypectomy. In hot snare, the wire loop is energized with an electric current to cut through the tissue and cauterize (seal) blood vessels simultaneously ^[1][2].
• Large Polyps (20mm and larger): These often require more advanced techniques like Endoscopic Mucosal Resection (EMR). In EMR, a liquid is injected under the polyp to “lift” it away from the deeper muscle layers of the colon, creating a safety cushion before the snare is used ^[1][3].

The Goal: Complete Excision

The success of a polypectomy depends on complete excision (removing every last bit of the abnormal tissue). If even a few microscopic cells are left behind at the edges, the polyp can grow back—this is called local recurrence ^[4].

• En Bloc vs. Piecemeal: Whenever possible, doctors try to remove a polyp “en bloc” (in one single piece). This makes it much easier for the pathologist to confirm that the margins are clear ^[5].
• Piecemeal Risks: For very large polyps, the doctor may have to remove them in multiple “piecemeal” fragments. While this is often necessary, it carries a significant risk: one large study found that up to 21% to 32% of large polyps removed in pieces eventually showed some regrowth at the original site ^[4].
• Margin Care: To prevent this regrowth, expert endoscopists may use “snare-tip soft coagulation” to heat-treat the edges of the removal site, which helps destroy any remaining microscopic cells ^[6].

When to Seek an Expert: Advanced Endoscopy

Not every doctor has the specialized training or equipment to remove complex polyps endoscopically. You may be referred to an advanced endoscopist or a specialized center if your polyp meets certain criteria ^[2][7]:

• Size: Any polyp 20mm (2 cm) or larger ^[2].
• Location: Polyps in “difficult” spots, such as tucked behind a fold or near the ileocecal valve (where the small and large intestines meet) ^[3][7].
• Recurrence: A polyp that was previously removed but has grown back in the same spot ^[2].
• Complex Shape: “Laterally spreading tumors” that are very flat and large ^[8].

Advanced Techniques: ESD, EFTR, and Surgery

In specialized centers, doctors may use even more precise tools:

• Endoscopic Submucosal Dissection (ESD): A specialized knife is used to slowly carve out a large polyp in one single piece. This is technically difficult and takes longer than EMR, but it is excellent for ensuring the polyp is entirely gone and allows for a very precise pathology review ^[5][9].
• Endoscopic Full-Thickness Resection (EFTR): A specialized, selected procedure where a special “over-the-scope” clip allows the doctor to remove the full thickness of the colon wall. This carries specific risks and requires careful selection ^[10].

If you are told you need surgery to remove a “benign” (non-cancerous) polyp, it is often worth promptly seeking a second opinion at an advanced endoscopy center or multidisciplinary team ^[11][12]. However, surgery is the appropriate oncologic treatment if there is suspected deep invasion of cancer, if invasive cancer is confirmed, or if the lesion is not endoscopically curable.

Warning Signs After Your Procedure

Polypectomy procedures, especially large or piecemeal resections, carry risks of complications such as delayed bleeding (which can occur days after the procedure). Follow your endoscopy unit’s discharge instructions closely. Seek urgent medical care or contact the endoscopy team if you experience:

• Substantial or persistent rectal bleeding, or passing clots.
• Black, tarry stools.
• Faintness or marked dizziness.
• Severe or worsening abdominal pain.
• Fever.
• Repeated vomiting.