Outside of the peritoneal cavity.
* * *
ex·tra·peri·to·ne·al -.per-ət-ən-'ē-əl adj located or taking place outside the peritoneal cavity <\extraperitoneal surgical drainage>
* * *
ex·tra·peri·to·ne·al (eks″trə-per″ĭ-to-neґəl) outside the peritoneal cavity.Medical dictionary. 2011.