Management of Tubular Adenoma with Focal High-Grade Dysplasia

Risk Stratification and Surveillance Recommendations

The American Cancer Society and US Multi-Society Task Force on Colorectal Cancer recommend a 3-year surveillance interval for patients with adenomas showing high-grade dysplasia, regardless of adenoma size, as high-grade dysplasia is an independent risk factor for advanced neoplasia 1, 2, 4
High-grade dysplasia in an adenoma significantly increases the risk of developing colorectal cancer, placing the patient in a higher-risk category that requires more intensive surveillance 2, 3

If the high-grade dysplasia adenoma was removed piecemeal, a shorter follow-up interval of 2-6 months is recommended to verify complete removal, based on both endoscopic and pathologic assessments 1, 2
Once complete removal has been confirmed, the standard 3-year surveillance interval should be implemented 2, 4

A high-quality baseline colonoscopy is defined as a procedure with complete examination to the cecum, photo documentation of cecal landmarks, adequate bowel preparation, and a minimum withdrawal time of six minutes from the cecum 5, 6, 7
Inadequate bowel preparation or incomplete examination warrants a repeat colonoscopy before planning a long-term surveillance program 1, 4

If the 3-year follow-up colonoscopy is normal or shows only 1-2 small tubular adenomas with low-grade dysplasia, the interval for subsequent examination should be extended to 5 years 1, 4
If high-risk features are found again at the follow-up examination, another 3-year interval is recommended 4, 3

Incomplete removal of adenomas with high-grade dysplasia is associated with an increased risk of interval colorectal cancer 6, 4

Discontinuation of surveillance colonoscopy should be considered in persons with serious comorbidities with less than 10 years of life expectancy, and endoscopists should make clear recommendations to primary care physicians about when the next colonoscopy is indicated 1
If the patient has multiple adenomas (>10) in addition to high-grade dysplasia, consider the possibility of an underlying familial syndrome and a shorter follow-up interval 1, 2