Abstract
This report describes a rare case of retroperitoneal hernia and its preoperative diagnosis. Contrast-enhanced CT and multiplanar reconstruction were used to observe the hernia ring, hernia tract, contents and blood flow of a retroperitoneal hernia. The diagnosis of and conditions related to the retroperitoneal hernia were confirmed by CT soon after hospitalisation. There are no reports on the diagnosis of primary retroperitoneal hernia on CT in the literature to date, and we share this case to facilitate the accurate and timely identification of small intestine retroperitoneal hernias in the future.