RESUMEN
Abdominal pain is one of the most Important and considerable issues in children. One of the most common causes of abdominal pain in children is acute appendicitis. The course of acute appendicitis in children is very faster than adults. Clinical manifestations in Pediatric patients are less typical and are not able to tell the exact history. In addition, no other signs or diagnostic tests can exactly detect the acute appendicitis in Pediatrics. Purpose of this study was the assessment of MAS in diagnosis is of acute appendicitis in Iranian Pediatrics patients. This prospective study was conducted in Loqman Hakim hospital in 1384-5 .Three hundred children aged from 4 to 12 years old with acute abdominal pain were assessed. All of information were taken from their data sheets and pathologic reports and scored in the form of 24 variables [age, sex ...] The results were analyzed via statistic soft ware spss 12 and absolutes score of MAS was counted on the basis of clinical variables. Based on the MAS the patients were divided to 2 groups: the first group were the patients with score of <7 including 147 cases [49 percent]. The second group were the patients the score of 37 Including 153 cases, [51 percent]. In overall, from 300 cases that operated with the suspicious of appendicitis, 269 cases [89.6%] in the pathologic assessment had acute appendicitis. from the patients with score of <7 [147 cases], 124 cases had diagnosis of acute appendicitis [84/35%] from the patients with score of 37 [153 cases], 145 cases had diagnosis of acute appendicitis [94.77%] this outcomes showed no significant difference between these groups in the diagnosis of appendicitis based of this score. According to this analysis, sensitivity of this scoring system in the diagnosis of acute appendicitis was 53.9% and the specificity was 74.19% showing the MAS in diagnosis of acute appendicitis in Iranian pediatric patients is not soley effective and can't be an absolute clue and should be progressed in sensitivity and specificity