sentences:  It was characterized in 1955 by internal medicine physician Leonard Wolsey Cronkhite Jr. and radiologist Wilma Jeanne Canada.Polyps are found throughout the GI tract (most frequently in the stomach and large intestine, followed by the small intestine) though typically avoid the esophagus.A biopsy will reveal them to be hamartomas; the possibility that they progress to cancer is generally considered to be low, although it has been reported multiple times in the past.