The document discusses the development of the mid-gut and anomalies that can occur. It describes how during development, the mid-gut rotates within the abdomen and how abnormalities in this rotation can lead to anomalies like the ascending colon being on the left side. It also lists several common anomalies of the mid-gut mesenteries, including mobile cecum and reto-colic pocket. Finally, it discusses other mid-gut anomalies such as stenosis or atresia of the intestinal lumen, subhepatic cecum and appendix, and remnants of the vitelline duct that can form structures like Meckel's diverticulum.