* * *
ret·ro·per·i·to·ne·um -.per-ət-ən-'ē-əm n, pl -ne·ums or -nea -'ē-ə the space between the peritoneum and the posterior abdominal wall that contains esp. the kidneys and associated structures, the pancreas, and part of the aorta and inferior vena cava
* * *
ret·ro·peri·to·ne·um (ret″ro-per″ĭ-to-neґəm) spatium retroperitoneale.Medical dictionary. 2011.