Background: It is still difficult to make the diagnosis of acute appendicitis in children with only clinical examination.Objectives: The present study, retrospectively reviewing the data of the patients that underwent appendectomy, aimed at emphasizing the diagnostic value of ultrasonography findings by comparing them with pathological diagnosis.Patients and Methods: This retrospective study included patients aged under 18, who were operated on for appendicitis between 1 January 2015 and 31 December 2015. The relationship between the pathology results of these patients and the results of preoperative ultrasonography performed for the diagnosis of acute appendicitis was investigated.Results: The study included 100 patients, 42 were female and 58 were male, on whom ultrasonography was performed and whose mean age was 11.33.7 years. While there were 28 (28%) patients who did not receive a definitive diagnosis of appendicitis pathologically, there were 43 (43%) patients in whom there were no ultrasonography findings supporting appendicitis. While appendicitis diagnosis was made pathologically in 72 patients (72%), suggestive findings of appendicitis, such as compression and double wall thickness of the appendix (over 6 mm), were detected in 57 patients (57%). In addition, 42% periappendiceal fluid collection, 25% periappendiceal fat inflammation, and 14% appendicolith were detected by ultrasonography. While 47 (65.3%) of the 72 patients with pathologically confirmed appendicitis received appendicitis diagnosis by ultrasonography, 25 (34.7%) did not (Pearson square test P=0.007). The sensitivity and specificity of ultrasonography in the diagnosis of appendicitis were 66.6% (48/72) and 64.28% (18/28), respectively.Conclusions: According to the results of the current study, ultrasonography, in the diagnosis of appendicitis, should only be used for the support of clinical diagnosis or for differential diagnosis.