Risk factors for malignant change in an asymptomatic patient with a gall bladder polyp on ultrasound include all of the following except

Gall bladder polyp more than 10 mm in size needs surgical intervention as the risk for developing malignancy is greater.Other risk factors include age>60 yrs,association with gallstones,rapid increase in size of polyp,symptomatic,sessile polyp. Reference:SRB's manual of surgery,5th edition,page no:658.