Prolonged Clinical Course and Unexpected Outcome of Postinfectious Glomerulonephritis in an 11-Year-Old Boy

Area of Science:

• Pediatric Nephrology
• Renal Pathology
• Glomerular Diseases

Background:

• Postinfectious glomerulonephritis (PIGN) is a common cause of acute kidney injury in children.
• Most children recover fully, but some experience persistent renal dysfunction or progress to renal failure.
• The long-term sequelae of PIGN, particularly progression to chronic forms of glomerulopathy, require further investigation.

Purpose of the Study:

• To report a rare case of an 11-year-old boy with biopsy-proven PIGN.
• To illustrate the progression of PIGN to focal and segmental glomerulosclerosis (FSGS) with persistent proteinuria, hematuria, and hypertension.
• To document the clinical and pathological findings over a 1-year follow-up period.

Main Methods:

• Biopsy-proven diagnosis of PIGN in an 11-year-old male.
• Clinical monitoring for proteinuria, hematuria, and hypertension post-PIGN treatment.
• Serial renal biopsies to assess morphological changes over time.
• Histopathological analysis including focal and segmental glomerulosclerosis (FSGS) and mesangial hypercellularity.

Main Results:

• The patient presented with persistent proteinuria, hematuria, and hypertension 1 year after PIGN treatment.
• A second renal biopsy revealed chronic glomerulopathy characterized by FSGS and mesangial hypercellularity.
• This indicates a progression from acute PIGN to a chronic glomerular disease.

Conclusions:

• Postinfectious glomerulonephritis can rarely progress to chronic kidney disease, such as FSGS.
• Persistent proteinuria, hematuria, and hypertension are indicators of potential long-term renal damage post-PIGN.
• This case underscores the importance of long-term follow-up for children diagnosed with PIGN to detect and manage chronic glomerulopathies.