Case Report: Acute Lower Gastrointestinal Bleeding Caused by Congenital Portosystemic Shunt: A Case Report and Review of the Literature

Lower gastrointestinal bleeding refers to bleeding within the lumen of the gastrointestinal tract located below the ligament of Treitz. In this study، we present a case with bleeding from massive anorectal varices، caused by a congenital high pressure Portosystemic shunt. A 31-year-old man with a prolonged history of painless rectal bleeding was referred to our center. The onset of symptoms was at the age of two years. Finally، he underwent semi-elective surgery due to severe bleeding and a diagnosis of portosystemic shunt was made intraoperatively.