<prompt> All of the following polyps are premalignant exceptJuvenile polyposis syndromeFamilial polyposis syndromeJuvenile polypPeutz jeger syndrome  <response>: .Juvenile Polyps- Commonest polyp of colorectum in infants and children. Can cause intussusception, prolapse through rectum, bleeding. Colonoscopic polypectomy is done. Not a pre-malignant condition. ref:SRB;s manual of surgery,ed 3,pg no 831 