Sisters with familial adenomatous polyposis affected with thyroid carcinoma, desmoid tumour and duodenal polyposis

Abstract
After prophylactic surgery for colonic polyposis, upper gastrointestinal cancer and desmoid tumour are the main causes of death in patients with familial adenomatous polyposis (FAP). Two sisters with FAP who developed multicentric carcinoma of the thyroid, desmoid tumour and duodenal polyposis are presented.