Which one of the following colonic polyps is not malignant?
Juvenile poyps have no malignant potential. All other conditions mentioned above are associated with increased risk of malignancy. So juvenile polyps is the single best answer of choice. Ref: Current Surgical Diagnosis and Treatment By Gerard M.Dohey, 12th Edition, Pages 682, 707.
Juvenile polyps
Hamaomatous polyposis associated with Peutz-Jeghers Syndrome
Villous adenomas
Tubular adenomas