Purpose : The correlation between sonographic findings and clinical symptoms was investigated in the patientswith mesenteric lymphadenitis who had recurrent acute abdomen. Materials and Methods : Seventy-eight childrenswith recurrent acute abdominal pain without obvious primary disease were evaluated by sonography. The initial andfollow-up sonography were performed in 17 children. The abdomen was divided into 3 areas. The number and size ofmesenteric lymph nodes were observed in each zone, and was compared with the clinical findings. Results : In56(71.8%) of 78 cases, good correlation was seen in the area of the greatest size and number of the lymph nodes inthe sonography. Most severe symptom, was seen in the right lumbar area(49 cases) and umbilical area(7 cases). In17 cases of follow up, 14 cases showed decreased size and number of mesenteric lymph nodes while 2 cases shpwedincrease in size and number of the nodes with aggravated symptoms. Conclusions : Ultrasonography was useful todetect and localize the enlarged mesenteric lymph nodes. Initial and follow-up sonography showed good correlationbetween the changes in number and size of the lymph nodes and symptoms.