Gardner Syndrome (GS) is a rare disease. It is a subtype (and severe form) of familial adenomatous polyposis (FAP). GS is an autosomal dominant disease characterized by Gastro Intestinal polyps, multiple osteomas, and skin and soft tissue tumors, specifically, epidermoid cysts, desmoid tumors, and other benign tumors.
Polyps have a 100% risk of undergoing malignant transformation. These are a lot of big words that basically mean your body has genes that are going to mutate, and these genes are going to try to kill you, like the Joker in the original Batman comics. Despite how hard you fight against the Joker he never seems to actually die.