Late Diagnosis of Familial Adenomatous Polyposis After Acute Lower Gastrointestinal Bleeding: A Case Report.

Familial adenomatous polyposis (FAP) is an autosomal dominant hereditary disease characterized by the progressive development of multiple adenomatous polyps along the colon. The majority of individuals develop colorectal cancer by the age of 40 within the evolutionary course of the disease. For this reason, screening family members is essential to enable identification, surveillance, and appropriate intervention. Colonoscopy is an essential examination in the follow-up of these patients. This case report aims to present an unusual case of a patient diagnosed with FAP after acute lower gastrointestinal bleeding at the age of 52. The recovery of the family history and the identification of multiple members with a mutation in the adenomatous polyposis coli (APC) gene supported the diagnosis.