Abstract
Familial adenomatous polyposis (FAP) is a well-described genetic condition that results in the development of multiple benign and malignant lesions throughout the gastrointestinal tract. The development of colorectal cancer is nearly universal in classic FAP, and total proctocolectomy after polyp development is recommended. We present a patient with FAP who was unable to undergo proctectomy. Despite careful removal of all rectal polyps before subtotal colectomy with ileorectal anastomosis, he developed 12 rectal polyps, including 4 advanced neoplastic lesions, within 73 days after initial endoscopic removal. This case highlights the rapid regrowth rate of colorectal adenomas in FAP.