Gardener's syndrome is a rare hereditary disorder involving the colon. It is characterized by:

Gardner's syndrome is a hereditary disorder characterized by adenomatous polyposis of large intestine in association with osteomas, epidermoid cysts, fibrous tumors of skin and congenital hyperophy of retinal pigment epithelium. Ref: Intestinal Polyps and Polyposis: From Genetics to Treatment and Follow-up By Gian Gaetano Delaini, Page 60