INTRODUCTION: @entity8 are an uncommon diagnosis, with a paucity of data comparing treatment modalities. @entity1 presentation ranges from persistent dull flank/ @entity490 with or without fevers, to those who are overtly ill, presenting with @entity1344 and @entity2259 . Management for pediatric renal @entity733 is typically based on results extrapolated from small series in adult cohorts, with conservative measures recommended when the lesion is <3  cm. OBJECTIVE: This study evaluated the presentation, management and outcomes of a contemporary cohort of pediatric @entity1 with renal @entity733 . STUDY DESIGN: A total of 16 consecutive pediatric @entity1 with radiologically diagnosed intra-renal or peri-nephric @entity733 from 1990 to 2012 were identified. @entity1 were identified by querying institutional records via ICD-9 and CPT codes referencing @entity8 . Charts were retrospectively reviewed to evaluate multiple clinical variables, including: presenting symptoms, size of abscess, management strategy and clinical outcomes. Clinical resolution was confirmed via repeat ultrasound or computed tomography. RESULTS: The median age at presentation was 13 years (range 1 month-18 years) and 13/16 @entity1 (81%) were female. @entity733 formation was secondary to: urinary tract infection in 13 (81%); hematogenous seeding from a @entity272 in one (6%); and an unknown etiology in two (12%) @entity1 . The most common organism identified on urine culture was @entity526 (10, 77%). Hematogenous seeding was confirmed in only one case, with @entity794 growing on culture from both a cutaneous lesion and percutaneous @entity8 . Overall, @entity733 were a median of 2.2  cm (IQR 2, 3.7), with 13 (81%) successfully managed with conservative therapy, including intravenous antibiotics, with resolution on repeat imaging at a median of 21 days (range 6-55). For @entity1 presenting with @entity733  <=3 cm, conservative measures were employed in 10/11 cases, with 100% success rate. Three @entity1 had larger @entity733 (3.8, 4, and 10  cm), which resolved after treatment with percutaneous drainage. A voiding cystourethrogram was performed in 10 @entity1 , with two (20%) detecting an abnormality (low-grade vesicoureteral reflux, which required no further intervention). CONCLUSIONS: @entity8 were most commonly small and secondary to an @entity526 UTI. Most small ( <=3 cm) renal @entity733 resolved with conservative management. Percutaneous drainage should be considered for lesions >3  cm and in @entity1 who remain persistently febrile, despite culture-specific antibiotics, are immunocompromised or critically ill.

XXXX : A  contemporary series.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients', 'Patient'] @entity8 :: ('MESH:D007674', 'Disease') :: ['drainage of the renal lesion', 'renal abscess', 'Pediatric renal abscesses'] @entity794 :: ('1280', 'Species') :: ['Staphylococcus aureus'] @entity272 :: ('MESH:D012871', 'Disease') :: ['skin infection'] @entity733 :: ('MESH:D000038', 'Disease') :: ['abscesses', 'Abscess'] @entity490 :: ('MESH:D015746', 'Disease') :: ['abdominal pain'] @entity1344 :: ('MESH:D043171', 'Disease') :: ['hemodynamic instability'] @entity2259 :: ('MESH:D016470', 'Disease') :: ['bacteremia'] @entity526 :: ('562', 'Species') :: ['Escherichia coli', 'E. coli']
@entity8 :: (MESH:D007674,Disease) :: ['Pediatric renal abscesses']
