Overview
Renal abscess is a localized infection within the kidney, often caused by enteric bacteria, presenting with fever, flank pain, and signs of systemic infection. It can manifest in various forms, including unusual presentations like pyelo-hepatic fistulas and suprarenal extension in neonates 14.Diagnosis
Clinical Presentation: Fever, flank pain, hematuria, and signs of sepsis 123.
Laboratory Tests: Elevated white blood cell count, inflammatory markers, and positive blood cultures 12.
Imaging: CT scan or MRI for definitive diagnosis, showing abscess characteristics and potential complications like fistulas or extension 1234.
Differentiation: Distinguishing from infected renal cysts or perinephric abscesses may require imaging and clinical context 3.Management
Antimicrobial Therapy: Broad-spectrum antibiotics initially, tailored based on culture and sensitivity results 12.
Percutaneous Drainage: Often used for abscesses larger than 3 cm, guided by CT 25.
Surgical Intervention: Required for complications like fistulas, extensive necrosis, or failure of percutaneous drainage 14.
Supportive Care: Management of sepsis, fluid balance, and renal function support 12.Special Populations
Pediatrics: Renal abscess is rare but can present atypically, such as as a palpable mass 3.
Neonates: Early surgical intervention is crucial for suprarenal abscesses extending into the kidney 4.
Postpartum: Obstetricians should consider renal abscess in the differential of postpartum fever 5.Key Recommendations
Early Imaging: Utilize CT or MRI for accurate diagnosis and assessment of complications (Evidence: Moderate 1234).
Antibiotic Therapy Tailored to Culture: Initiate broad-spectrum antibiotics and adjust based on microbiological data (Evidence: Moderate 12).
Percutaneous Drainage for Large Abscesses: Consider guided percutaneous drainage for abscesses exceeding 3 cm (Evidence: Weak 25).
Surgical Consultation for Complicated Cases: Seek surgical intervention for cases involving fistulas, extensive necrosis, or refractory abscesses (Evidence: Expert opinion 14).References
1 Chung SD, Chen KH, Chang HC. Pyelo-hepatic fistula. Urology 2008. link
2 Kaneti J, Hertzanu Y. Renal abscess owing to salmonella septicemia: percutaneous drainage. The Journal of urology 1987. link43160-0)
3 Pintér AB, Schäfer J. Renal abscess in infancy. Acta paediatrica Hungarica 1983. link
4 Vigi V, Tamisari L, Osti L, Franchella A, Georgacopulo P. Suprarenal abscess in a newborn. Helvetica paediatrica acta 1981. link
5 Soules MR, Stables DP, Pfister RR. Renal carbuncle: unusual cause of postpartum febrile morbidity. The Journal of reproductive medicine 1976. link