Management of Small Gallbladder Polyps

Size-Based Risk Assessment

• Polyps ≤5-6mm have zero documented malignancy risk across multiple large studies, including a systematic review showing 0% malignancy in polyps <5mm and a survey of approximately 3 million gallbladder ultrasounds with no documented cancers in polyps <10mm at initial detection 1
• The American College of Radiology and Society of Radiologists in Ultrasound establish intervention thresholds, and a 3mm polyp falls well below these thresholds 1
• Up to 83% of apparent polyps ≤5mm are not even found at subsequent cholecystectomy, suggesting many represent imaging artifacts or transient findings 1

High-Risk Features

• Primary sclerosing cholangitis is associated with a dramatically elevated 18-50% malignancy risk 4
• The presence of specific high-risk features, such as sessile morphology, may warrant follow-up ultrasound at 6 months, 1 year, and 2 years 2

Future Imaging Considerations

• No routine surveillance is needed for a 3mm polyp, but future imaging would be warranted if the patient develops biliary symptoms or if incidental imaging shows the polyp has grown to ≥10mm 2
• If future imaging shows growth to ≥10mm, surgical consultation becomes appropriate 2