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Renal cortical scarring in acute pyelonephritis
M Tsugaya1, N Hirao, H Sakagami
1Department of Urology, Nagoya City University, Japan.
British Journal of Urology
|March 1, 1992
Summary
Acute pyelonephritis can lead to renal scarring, detectable by computed tomography (CT) even when intravenous urography is normal. The extent of initial kidney damage is the primary factor determining scar formation.
Area of Science:
- Nephrology
- Radiology
- Infectious Diseases
Background:
- Acute pyelonephritis is a common kidney infection.
- Renal scarring is a potential complication of pyelonephritis.
- Early detection of scarring is crucial for patient management.
Purpose of the Study:
- To evaluate the formation of renal scarring after acute pyelonephritis.
- To compare the diagnostic capabilities of computed tomography (CT) and intravenous urography in detecting renal scars.
- To identify determinants of renal scar formation.
Main Methods:
- Serial computed tomography (CT) and intravenous urography were performed on 14 patients with acute pyelonephritis.
- Assessment of renal parenchymal atrophy (cortical scarring) was conducted.
- Correlation of scar formation with fever duration, severity of renal involvement, and initial lesion extent.
Main Results:
- CT detected renal parenchymal atrophy (cortical scarring) in 6 of 14 patients, while urography showed normal results.
- Scarring developed between 61 and 187 days post-infection.
- Scar formation was more frequent and rapid in patients with severe initial renal involvement, particularly when lesions occupied over 30% of the parenchyma.
Conclusions:
- The extent of initial renal parenchymal involvement is the most significant predictor of eventual renal scar formation.
- CT is more sensitive than intravenous urography for detecting early renal scarring after acute pyelonephritis.
- Recurrent fever duration may influence the timing of scar development.