A simple mnemonic to help remember the retroperitoneal structures of the abdomen and thorax is: SAD PUCKER S- suprarenal glands A- aorta and IVC D- duodenum (2nd to 4th part) P- pancreas (except tail) U- ureters C- colon (ascending and descending) K-kidneys E- esophagus (thoracic part) R- rectum