NCIt related terms : spatium retroperitoneale; retroperitoneal space;
NCIt definition : The back of the abdomen where the kidneys lie and the great blood vessels run.;
Alternative definition : CDISC: The region of the abdomen outside the peritoneum, where the kidneys lie and
the great blood vessels run.; UBERON: Anatomical space in the abdominal cavity behind (retro) the peritoneum. It
has no specific delineating anatomical structures. Organs are retroperitoneal if they
only have peritoneum on their anterior side.;