A Rare Case of Duodenum Inversum in a Pediatric Patient

Duodenum inversum is a rare congenital anomaly, where the third portion of the duodenum reverses direction and travels posteriorly and superiorly prior to crossing the midline. This condition is associated with nonspecific symptoms such as abdominal distension, epigastric pain, and nausea and is typically found incidentally. This report discusses the findings of duodenum inversum in a 6-year-old male who presented with recent weight loss, nausea, vomiting, abdominal pain, and physical exam findings concerning for superior mesenteric artery syndrome and ultimately found to have functional abdominal pain.