nierabces

Nierabces, or renal abscess, is a localized collection of pus within the kidney parenchyma (intrarenal abscess) or in the surrounding perinephric space (perinephric abscess). It typically arises as a complication of acute pyelonephritis or bacteremia and can be caused by a range of bacteria, most commonly Escherichia coli and Klebsiella pneumoniae, with other organisms including Proteus, Pseudomonas, and anaerobes. Risk factors include diabetes mellitus, urinary tract obstruction or stones, immunosuppression, and prior urinary tract infections.

Clinical presentation usually includes fever, chills, flank or groin pain, and tenderness over the costovertebral angle, often accompanied by malaise and nausea. Some patients may develop sepsis, especially if diagnosis or treatment is delayed. Urinalysis may show pyuria, and blood cultures can be positive; urine cultures help guide therapy.

Diagnosis relies on imaging and laboratory testing. Ultrasound can detect fluid collections but may miss small lesions; contrast-enhanced computed tomography is the preferred modality to delineate the extent of the abscess and to guide drainage. Laboratory tests typically show leukocytosis and elevated inflammatory markers.

Management involves prompt intravenous antibiotics with broad coverage for Gram-negative and sometimes anaerobic bacteria, tailored to culture results. Small intrarenal abscesses may respond to antibiotics alone, while larger abscesses or those not improving with antibiotics usually require percutaneous drainage. Obstructive lesions should be relieved. Nephrectomy is rarely necessary. Prognosis is favorable with timely treatment but delayed therapy can lead to sepsis or renal impairment.