<prompt> All of the following are risk factors for malignant change in a gall bladder polyp, except:Age 60 yearsRapid increase in size of polypSize of polyp 5 mmAssociated Gall stones  <response>: Risk factors for malignant change in an asymptomatic patient with a gall bladder polyp are: polyp size greater than 10mm, age 50years, and presence of gallstones. There is greater risk of malignancy in polyps in patients with primary sclerosing cholangitis. Endoscopic ultrasound helps in differentiating cholesterol polyps from malignant polyps. Ref: Sherlocks Diseases of The Liver and Biliary System By James S. Dooley, Page 277; Diseases of The Gallbladder and Bile Ducts: Diagnosis and Treatment By Pierre-Alain Clavien, John Baillie, John Baillie FRCP Glasg., Page 49 