<prompt> Diffuse peritonitis following appendicitis is usually seen -When appendicular perforation occurs early within 24 hoursWhen perforation occurs late after 24 hoursParticularly in non-obstructive appendicitisWhen antibiotics are withheld  <response>: In late stages greater omentum and small bowel become adherent to inflamed appendix, walling off the spread of peritoneal contamination 