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Background  Renal abscesses are relatively uncommon in children but may result in prolonged hospital stays and life-threatening events. We undertook this study to analyze the clinical spectrum of renal abscesses in children admitted to the pediatric emergency department (ED) and to find helpful clinical characteristics that can potentially aid emergency physicians for detecting renal abscesses in children earlier.    Methods  From 2004 to 2011, we retrospectively analyzed 17 patients, aged 18 years or younger, with a definite diagnosis of renal abscess admitted to the ED. The following clinical information was studied: demographics, clinical presentation, laboratory testing, microbiology, imaging studies, treatment modalities, complications, and long-term outcomes. We analyzed these variables among other potential predisposing factors.    Results  During the 8-year study period, 17 patients (7 males and 10 females; mean age, 6.1 ± 4.5 years) were diagnosed with renal abscesses on the basis of ultrasonography and computed tomography findings. The 2 most common presenting symptoms were fever and flank pain (100% and 70.6%, respectively). All of the patients presented with leukocytosis and elevated C-reactive protein (CRP) levels. Organisms cultured from urine or from the abscess were identified in 11 (64.7%) patients, and  Escherichia coli  was the most common organism cultured. All patients were treated with broad-spectrum intravenous antibiotics with the exception of 4 children who also required additional percutaneous drainage of the abscess.    Conclusions  Renal abscesses are relatively rare in children. We suggest that primary care physicians should keep this disease in mind especially when children present with triad symptoms (fever, nausea/vomiting, and flank pain), pyuria, significant leukocytosis, and elevated CRP levels. However, aggressive percutaneous drainage may not need to be routinely performed in children with renal abscesses.

Clinical assessment of children with renal abscesses presenting to the pediatric emergency department