Value and interpretation of resection margin after a colonoscopic polypectomy for malignant polyps

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Surgical Pathology

Background:

• Malignant colorectal polyps pose a treatment challenge.
• Endoscopic polypectomy is a primary intervention, but the need for subsequent surgery is debated.

Purpose of the Study:

• To compare clinicopathologic findings of endoscopic polypectomy versus surgery for malignant polyps.
• To assess the resection margin as an indicator for surgery in malignant colorectal polyps.

Main Methods:

• Retrospective analysis of 70 patients undergoing endoscopic polypectomy (April 2003-April 2010).
• Patients divided into non-operation (polypectomy only, n=37) and operation (polypectomy with surgery, n=33) groups.
• Clinicopathologic characteristics, complications, and prognoses were examined.

Main Results:

• Higher rates of ulceration and submucosal invasion in the non-operation group.
• Incomplete resection margins were more frequent in the operation group (93.9% vs 51.4%).
• No residual tumor was detected in 93.9% of the operation group; 41.7% of non-operation group polyps had cancer-free margins.

Conclusions:

• A safe margin criterion, including coagulation zones, may be acceptable.
• Multidisciplinary discussion among surgeons, endoscopists, and pathologists is essential for treatment decisions based on risk factors.