Polyps, Cholesterosis, and Gallbladder Sludge on Ultrasound: Differentiation and Management by Size
Gallbladder Polyps: Size as a Predictor of Malignancy
According to ExpertDDx, size is the main predictor of gallbladder polyp malignancy: 100% of polyps ≥2 cm are found to be malignant. Polyps ≥10 mm usually require cholecystectomy, whereas smaller ones are managed with serial dynamic observation (ExpertDDx: Abdomen and Pelvis, 2023).
Management Based on Size
| Polyp Size | Management |
|---|---|
| < 10 mm | Serial dynamic observation (ExpertDDx) |
| ≥ 10 mm | Typically cholecystectomy (ExpertDDx) |
| ≥ 2 cm | 100% malignancy (ExpertDDx) |
Intervals and frequency of ultrasound monitoring for polyps <10 mm are not provided in the given excerpts [clarify].
Cholesterosis and Hyperplastic Cholecystoses
Hyperplastic cholecystoses, including focal adenomyomatosis, appear on ultrasound as focal heterogeneously echogenic formations in the gallbladder wall. On CT correlation, focal adenomyomatosis is characterized by multiple cystic spaces in the gallbladder fundus area (ExpertDDx, 2023).
Differential Diagnosis of Intraluminal Lesions
When identifying a gallbladder lesion, the possibility of an intramural hematoma should be considered—a rare consequence of trauma, usually associated with blood in the gallbladder lumen/hemobilia (ExpertDDx, 2023). Criteria for differentiating gallbladder sludge are not described in the provided excerpts [clarify].
The Role of Ultrasound in Primary Care
Assessment of gallbladder wall polyp and congested gallbladder is part of the studies discussed within PoCUS in primary care; in some Delphi studies, these positions were excluded as technically challenging or rarely encountered (Andersen et al., EFSUMB, 2026).
Frequently asked questions
At what size is a gallbladder polyp indicated for cholecystectomy?
Polyps ≥10 mm typically require cholecystectomy; smaller ones are managed with serial dynamic observation (ExpertDDx, 2023).
How high is the risk of malignancy in large polyps?
100% of polyps ≥2 cm are malignant; size is the main predictor of malignancy (ExpertDDx, 2023).
What does focal adenomyomatosis look like on ultrasound?
As a focal heterogeneously echogenic formation in the gallbladder wall; on CT, multiple cystic spaces in the fundus area (ExpertDDx, 2023).
What should be considered with an intraluminal lesion with signs of blood?
An intramural hematoma—a rare consequence of trauma, usually associated with blood in the gallbladder lumen/hemobilia (ExpertDDx, 2023).
What are the observation intervals for polyps less than 10 mm?
Specific observation intervals are not provided in the given sources [clarify].