During a routine upper endoscopy or colonoscopy, doctors frequently identify abnormal growths along the mucosal lining of the stomach or intestines, medically termed gastrointestinal polyps.
While discovering that you have polyps can cause initial concern, modern medical advancements have transformed how these lesions are managed. Today, even complex or large polyps that previously required major open or laparoscopic bowel resection can be completely removed through specialized, scarless endoscopic procedures.
Understanding the Types of Gastrointestinal Polyps
Polyps generally grow in two distinct anatomical shapes, which dictates the method required to remove them:
1. Pedunculated Polyps (Stalked Polyps)
These polyps grow attached to the intestinal wall by a slender stalk or stem, resembling a mushroom. Because they stand raised from the surrounding tissue, they can easily be looped, cut, and removed during standard endoscopy using a simple wire snare (polypectomy). They generally carry a lower comparative risk of malignancy.
2. Flat Polyps (Sessile Lesions)
Unlike stalked polyps, flat polyps spread horizontally across the surface lining of the stomach or bowel. They can vary widely in size—from under one centimeter to extensive growths measuring 8 to 10 centimeters across.
Flat polyps present two distinct clinical challenges:
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Higher Malignancy Potential: They have a significantly higher tendency to develop into pre-cancerous or cancerous lesions compared to stalked polyps.
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Complex Removal: Because they lack a distinct stem and adhere tightly to the inner lining, standard snare polypectomy is insufficient for removing them safely in one piece.
How Endoscopic Submucosal Dissection (ESD) Works
Historically, large flat polyps required major invasive surgery to resect the affected section of the stomach or colon. Today, Endoscopic Submucosal Dissection (ESD) enables the complete removal of these lesions directly through natural internal pathways without making a single surgical incision on the skin.
The Step-by-Step Procedure:
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Submucosal Injection: A specialized fluid cushion is injected directly into the submucosal layer beneath the polyp. This lifts the lesion safely away from the underlying deeper muscular wall of the intestine.
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Micro-Dissection: Using specialized endoscopic electrosurgical micro-knives, the specialist meticulously cuts around and underneath the raised lesion.
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En Bloc Resection: The flat polyp is removed entirely in one single, intact specimen (en bloc), ensuring complete clearance of the lesion margins.
Key Advantages of the ESD Technique
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Complete Tissue Clearance: Removing the entire lesion intact allows pathologists to confirm that the edges (margins) and base are completely clear of abnormal or malignant cells.
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Organ Preservation: Preserves the natural anatomy and digestive function of the stomach and bowel by avoiding organ-shortening surgical resections.
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No External Scars: Performed entirely through the endoscope, leaving zero external surgical cuts or scars.
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Rapid Recovery and Discharge: While the procedure is technically demanding and can take between 2.5 to 5 hours depending on the size and location of the lesion, patients recover quickly and can generally be discharged home shortly after the procedure.
Managing Potential Risks
As with any advanced therapeutic procedure, ESD carries minor potential risks, primarily localized bleeding or a tiny perforation (micro-tear) in the intestinal wall.
However, modern therapeutic endoscopy is equipped with advanced hemoclips and endoscopic closure devices that allow specialists to control bleeding and seal any micro-perforations immediately during the same procedure, rarely ever requiring emergency open surgery.
Summary
Discovering flat or large polyps in the digestive tract no longer necessitates major abdominal surgery. With advanced minimally invasive techniques like Endoscopic Submucosal Dissection (ESD), physicians can precisely lift and remove high-risk growths in a single piece, effectively preventing gastrointestinal cancers while ensuring a fast, smooth recovery.
