A Rare Case of Isolated Hindgut Malrotation with Internal Hernia and Coexisting Enteric Duplication Cyst.

An eight-year-old boy presented with a history of intermittent episodes of spastic abdominal pain accompanied by bilious vomiting. Imaging revealed an abnormal position of the large bowel loop, which was associated with an abnormal vascular course. Additionally, a mesenteric cystic lesion was found in relation to the small bowel. A possibility of isolated hindgut malrotation with an enteric duplication cyst was suggested based on these findings. The surgical team confirmed this diagnosis during the procedure. Furthermore, they discovered an internal hernia intraoperatively, with a defect in the colonic mesentery through which the terminal ileum, ileocecal junction, cecum, and appendix herniated.