The retroperitoneum is a specific anatomical space located behind the peritoneum, which is the thin membrane that lines the abdominal cavity and covers most of the abdominal organs. The retroperitoneum is positioned between the posterior abdominal wall and the peritoneum.

Within the retroperitoneum, various structures are found, including the kidneys, adrenal glands, aorta, inferior vena cava, lymph nodes, and portions of the digestive system such as the duodenum and pancreas. The retroperitoneal space provides a protective compartment for these structures and allows for their proper functioning.

Surgeries or procedures involving the retroperitoneum may be necessary for the treatment of conditions or diseases affecting the organs or structures in this area. Understanding the anatomy and specific characteristics of the retroperitoneum is important for surgeons and healthcare professionals when performing interventions or interpreting imaging studies related to this region.