[Postinfectious rapidly progressive glomerulonephritis in a pediatric patient]

Area of Science:

• Pediatric Nephrology
• Immunopathology

Background:

• Postinfectious glomerulonephritis (PIGN) is a kidney disease that can occur after an infection.
• Rapidly progressive glomerulonephritis (RPGN) is a severe form of kidney disease with a poor prognosis.
• C3 glomerulopathies share overlapping features with PIGN, complicating diagnosis.

Observation:

• A 4-year-old boy presented with fever, respiratory symptoms, and poor appetite.
• Clinical findings included microscopic hematuria, proteinuria, reduced glomerular filtration, and low C3 complement levels.
• Renal biopsy revealed crescent formation, C3 deposition, and subepithelial humps.

Findings:

• The case highlights a rare presentation of PIGN mimicking RPGN in a child.
• Diagnostic tools like immunofluorescence and C3 nephritic factor determination are vital for differentiating PIGN from C3 glomerulopathies.
• The patient was diagnosed with PIGN manifesting as crescentic glomerulonephritis.

Implications:

• This case underscores the importance of considering PIGN in children with acute kidney injury, even with RPGN features.
• Timely diagnosis and appropriate treatment, potentially including corticosteroids and immunosuppressants, can improve renal outcomes.
• Further research into the overlap between PIGN and C3 glomerulopathies is warranted to refine diagnostic and therapeutic strategies.