Acute appendicitis is the most common condidition, requiring emergency operation in children. Late appendicitis is still a major sours of morbidity and potential mortality. The charts of all pediatric appendectomy patients (150 cases) treated between 1367-1373 (Iranian calender) in Amir Kabir Medical Center were reviewed. Mean hospital stay was 4.7 days. Mean ages of patients was 8.5 years. Mal...