Abstract: ［Abstract］ Objective〖HTSS〗〓To investigate the clinical diagnosis value of pediatric appendicitis score(PAS) combined with ultrasound for acute appendicitis and mesenteric lymphadenitis in children.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓A total of 194 cases were selected in our hospital because of abdominal pain. Both of PAS and ultrasound diagnosis were used to diagnose patients, the diagnostic value of three diagnostic methods were evaluated.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The final pathological examination confirmed 87 cases of acute appendicitis and 56 cases of acute mesenteric lymphadenitis. The sensitivity, specificity and accuracy of PAS combined with ultrasonography in the diagnosis of acute appendicitis were 96.55%， 93.46% and 94.85%， respectively, which were higher than the PAS(74.71%, 66.36%, 70.10%) and ultrasound diagnosis(88.51%, 92.52%, 90.72%) . The sensitivity, specificity and accuracy of PAS combined with ultrasonography in the diagnosis of mesenteric lymphadenitis were 98.21%， 97.10% and 97.42%，respectively, which were higher than the PAS(25.00%, 63.92%, 79.71%) and ultrasound diagnosis(92.86%, 94.33%, 94.93%).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓PAS combined with ultrasound in the diagnosis of mesenteric lymphadenitis and acute appendicitis has high sensitivity, specificity and  accuracy.

Key words: appendicitis, mesenteric lymphadenitis, ultrasonography