Colonoscopy in a 52-year-old man removes a single sessile tubular adenoma measuring 12 mm, histology showing high-grade dysplasia with complete excision margins. When should surveillance colonoscopy be performed?
- A Within 6 months
- B At 1 year
- C At 3 years ✓
- D At 10 years
Correct answer: C. At 3 years
Explanation
An advanced adenoma, defined as size 10 mm or greater, villous histology, or high-grade dysplasia, places the patient in the high-risk category for metachronous neoplasia, warranting repeat colonoscopy at 3 years. Intervals of 6 months or 1 year apply only to piecemeal removal of large sessile lesions where residual tissue must be excluded early. A 10-year interval is reserved for patients with only one or two small tubular adenomas with low-grade dysplasia.
Reference: Sabiston Textbook of Surgery, 21st ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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