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Benign nephrosclerosis: incidence, morphology and prognosis
S Takebayashi1, Y Kiyoshi, S Hisano
1Second Department of Pathology, School of Medicine, Fukuoka University, Japan. take@fukuoka-u.ac.jp
Clinical Nephrology
|June 8, 2001
Summary
Benign nephrosclerosis (BNS) can lead to end-stage renal disease, especially with uncontrolled hypertension and significant glomerulosclerosis. Early identification of poor prognostic factors in BNS is crucial for patient outcomes.
Area of Science:
- Nephrology
- Pathology
- Hypertension
Background:
- Benign nephrosclerosis (BNS) is often misdiagnosed, confused with IgA nephritis (IgAN) or thin basement membrane disease (TBMD).
- Understanding the distinct clinicopathological features and prognosis of decompensated BNS is essential for accurate diagnosis and management.
Purpose of the Study:
- To examine the clinicopathological features, incidence, and prognosis of decompensated benign nephrosclerosis (BNS).
- To differentiate BNS from other renal diseases like IgAN and TBMD, particularly in hypertensive patients.
Main Methods:
- Analysis of 590 adult cases of BNS from 7,108 renal biopsies (8.3% prevalence).
- Mean patient age was 56.5 years; follow-up ranged from 3 to 22 years.
- Clinicopathological data and prognostic factors were assessed.
Main Results:
- Progressive BNS significantly increased the risk of end-stage renal disease within 5 years.
- Poor prognostic indicators included uncontrolled hypertension, global glomerulosclerosis (≥41%), collapsed glomeruli, and segmented/semi-global glomerulosclerosis.
- Tubulointerstitial damage and glomerular hypertrophy were secondary to glomerulosclerosis.
Conclusions:
- Glomerulosclerosis in BNS results from ischemia due to preglomerular vessel narrowing and glomerular hypertrophy from autoregulation loss.
- These pathological changes can coexist within the same kidney and different nephron units.
- Identifying prognostic factors aids in managing BNS and preventing disease progression.