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Acute focal bacterial pyelonephritis

W D Boam¹, W F Miser

¹Tripler Army Medical Center, Honolulu, Hawaii, USA.

American Family Physician

|September 1, 1995

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Acute focal bacterial pyelonephritis, an inflammatory kidney condition, is diagnosed using imaging like ultrasonography and CT scans. It effectively resolves with antibiotic treatment and follow-up imaging.

Area of Science:

Nephrology
Infectious Diseases
Radiology

Background:

Acute focal bacterial pyelonephritis presents as a renal inflammatory disease.
It shares characteristics with both pyelonephritis and renal abscess.
Diagnosis relies on clinical signs and specific radiologic findings.

Purpose of the Study:

To outline the diagnostic criteria for acute focal bacterial pyelonephritis.
To describe the typical imaging features and recommended investigations.
To detail the management and expected outcomes of this condition.

Main Methods:

Diagnosis is based on clinical symptoms of pyelonephritis.
Radiologic imaging, including ultrasonography and computed tomographic (CT) scanning, is crucial.

Related Experiment Videos

Ultrasonography shows resolving cortical mass lesions; CT reveals hypodense areas or swelling.

Voiding cystourethrogram is used to exclude reflux; MRI is not typically required.

Main Results:

Ultrasonography demonstrates renal mass lesions that resolve with antibiotic therapy.
CT scans show localized, poorly enhancing, hypodense areas or kidney swelling.
Escherichia coli is the most frequent causative agent.
Conservative management with oral bactericidal antibiotics leads to complete resolution in 1–3 months.

Conclusions:

Acute focal bacterial pyelonephritis is a distinct entity diagnosed via clinical and imaging findings.
Effective treatment involves extended courses of oral antibiotics.
Follow-up ultrasonography is essential to confirm complete resolution.