A Rare Case of Arteriovenous Fistula between the Inferior Mesenteric Artery and Vein

The inferior mesenteric artery, which is one of the anterior branches of the abdominal aorta, arises from the anterior aspect of the abdominal aorta and is posterior in relation to the third part of the duodenum, at the level of the third lumbar vertebra. The superior rectal vein, which originates from the internal rectal venous plexus, crosses the common iliac vein of the left side, medial in relation to the left ureter, and ascends as the inferior mesenteric vein, ultimately draining into the splenic vein. During routine cadaveric dissection of the abdomen at the Department of Anatomy, KAHER’s Jawaharlal Nehru Medical College, Belagavi, an arteriovenous fistula was found as a communication in between the inferior mesenteric artery and the inferior mesenteric vein. Arteriovenous fistulas within the abdomen can be either congenital (owing to lack of regression of undeveloped embryonic veins) or the result of unintentional trauma. This case report highlights the importance of understanding anatomical variations in the abdominal vasculature. Knowledge of such variations is crucial for surgeons, radiologists, and clinicians to ensure accurate diagnosis and treatment of gastrointestinal disorders.