<prompt> Most common site of intra peritoneal abscess?Morrisons pouchOmental bursaPelvic regionLeft subhepatic pouch  <response>: Pelvic abscess is the most common intraoeritoneal abscess50-60.Causes include- appendicitis,pelvic infections,sequelae of diffuse peritonitis,post operative and other abdominal causes.Organisms include Bacteroides fragilis,E.coli,anaerobic streptococci. Reference :SRBs manual of surgery,5th edition,page no:574. 