<prompt> All are true about hepatic cystadenoma exceptAge 40 years and asymptomaticMalignant predispositionSurgical resection is requiredLarge projection with thickened wall is suggestive of malignancy  <response>: Majority of patients of biliary cystadenoma presents with a history of abdominal pain or mass Ref: Sabiston 20th edition Pgno : 1469 