Bile duct cysts: Todani classification
A gallbladder polyp is a common incidental finding on ultrasound. Most suspected gallbladder polyps on ultrasound do not have malignant potential and are either hyperplastic or lipid deposits (cholesterolosis), but some of the gallbladder polyps are (pre)malignant. Therefore follow-up or cholecystectomy is advised. A gallbladder polyp is found in 0.004 to 13.8 percent of resected gallbladders and in 1.5 to 4.5 percent of gallbladders inspected by abdominal ultrasound.
Wiles R, Thoeni RF, Barbu ST, et al. Management and follow-up of gallbladder polyps : Joint guidelines between the European Society of Gastrointestinal and Abdominal Radiology (ESGAR), European Association for Endoscopic Surgery and other Interventional Techniques (EAES), International Society of Digestive Surgery - European Federation (EFISDS) and European Society of Gastrointestinal Endoscopy (ESGE). Eur Radiol. 2017;27(9):3856‐3866. doi:10.1007/s00330-017-4742-y