Treatment of Rectal Cancer in a Sessile Polyp (pT1) Completely Removed with Clear Margins and Favorable Histology
Clinical Scenario
This protocol addresses rectal cancer arising within a sessile polyp (adenoma) of the rectum with invasion limited to the submucosa (pT1). The defining feature is a single specimen that has been completely removed endoscopically, with favorable histologic features and clear margins.
Defining Criteria
- Sessile rectal polyp with invasive cancer confirmed on pathology
- Single specimen, completely excised (pT1 staging)
- Clear (negative) margins on the removed specimen
- Favorable histologic features: grade I or II histology, no lymphovascular invasion
Endoscopically removed malignant sessile polyps with grade I or II histology, negative margins, and no lymphovascular invasion can be successfully treated with endoscopic polypectomy alone. Rectal surgery is also an option for these patients.
Management Approach (partial)
For this specific presentation, the structured protocol includes a non-surgical observation pathway as one option, alongside surgical approaches when clinically appropriate.The full decision criteria, sequencing, and surgical selection guidance are in the complete protocol.
References
- Sessile polyp with invasive cancer.
- Single specimen, completely removed with favorable histologic features and clear margins (pT1 only).
- Endoscopically removed malignant sessile polyps with grade I or II histology, negative margins, and no lymphovascular invasion can be successfully treated with endoscopic polypectomy alone.
- Rectal surgery is also an option for these patients.
- Observe; or transanal local excision, if appropriate; or transabdominal resection.
- Rectal surgery consists of either a transanal local excision, if appropriate, or a transabdominal resection.
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