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Focal segmental glomerulosclerosis: unremitting proteinuria of long duration as a possible etiology?

H Tanaka1, S Waga, T Nakahata

  • 1Department of Pediatrics, Hirosaki University School of Medicine, Japan. hirotana@cc.hirosaki-u.ac.jp

The Tohoku Journal of Experimental Medicine
|February 24, 2001
PubMed

Insights

This case study follows a Japanese boy with persistent proteinuria. Repeated biopsies initially suggested minimal-change disease, but later revealed focal segmental glomerulosclerosis, indicating disease progression.

Area of Science:

  • Nephrology
  • Pediatric Nephrology
  • Renal Pathology

Background:

  • Minimal-change disease (MCD) is a common cause of nephrotic syndrome in children, characterized by proteinuria and edema.
  • Steroid-resistant proteinuria presents a diagnostic and therapeutic challenge, often requiring further investigation.
  • Long-term follow-up is crucial for understanding disease evolution in pediatric kidney diseases.

Observation:

  • A 9-year-old Japanese boy presented with a 6-year history of steroid-resistant proteinuria.
  • Repeated renal biopsies initially diagnosed minimal-change disease (MCD) at ages 3.5 and 8.5 years.
  • Despite persistent proteinuria, the patient remained asymptomatic until severe tubulointerstitial lesions were noted at 11.5 years.

Findings:

  • The fifth renal biopsy, performed after observing tubulointerstitial lesions, revealed focal segmental glomerulosclerosis (FSGS).
  • This finding suggests that the initial diagnosis of MCD may have masked an underlying or evolving FSGS.
  • The long duration of unremitting proteinuria could be attributed to the progression from MCD to FSGS.

Implications:

  • This case highlights the importance of serial renal biopsies in cases of steroid-resistant proteinuria with prolonged disease duration.
  • It suggests that some cases initially diagnosed as MCD may represent an early stage of FSGS.
  • Understanding this potential progression is critical for optimizing treatment strategies and improving outcomes in pediatric kidney disease.

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