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Segmental membranous glomerulonephritis
Abstract:
Each of the four stages of membranous glomerulonephritis (MGN) has a characteristic ultrastructural appearance. This report described four children with another distinctive pattern of MGN, which we propose to call segmental membranous glomerulonephritis (SMGN). In all cases there were segmentally distributed subepithelial or intramembranous electron-dense or electron-lucent deposits and prominent spikes. Less than 50% of capillary loops per glomerulus were affected. Granula deposits of IgG were identified by immunofluorescence microscopy, but deposits were either absent or less intensely fluorescent in repeated biopsies. All four patients had proteinuria. Three patients have normal creatinine clearances with either diminished proteinuria (one patient) or no proteinuria (two patients) after a mean follow-up of ten years. The fourth patient died of an unrelated cause. The evolution of MGN and SMGN is discussed and it is proposed that SMGN represents partial resolution of MGN.
Insights
Segmental membranous glomerulonephritis (SMGN) is a distinct pattern observed in children, potentially representing partial resolution of membranous glomerulonephritis (MGN). This finding offers new insights into the progression of kidney disease.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Renal Pathology
Background:
- Membranous glomerulonephritis (MGN) typically presents with characteristic ultrastructural findings across four stages.
- A novel pattern of MGN, termed segmental membranous glomerulonephritis (SMGN), was observed in pediatric patients.
Purpose of the Study:
- To describe the distinct ultrastructural and clinical features of SMGN in children.
- To propose that SMGN represents a stage in the evolution or partial resolution of MGN.
Main Methods:
- Ultrastructural examination of kidney biopsies to identify deposits and spikes.
- Immunofluorescence microscopy to detect immunoglobulin G (IgG) deposits.
- Clinical assessment including proteinuria and creatinine clearance over a ten-year follow-up period.
Main Results:
- Four pediatric patients exhibited segmentally distributed subepithelial or intramembranous deposits and prominent spikes, affecting less than 50% of capillary loops.
- Granular IgG deposits were detected by immunofluorescence, with reduced intensity in follow-up biopsies.
- Three patients maintained normal creatinine clearance, with resolution or diminution of proteinuria over ten years.
Conclusions:
- SMGN presents a unique pattern of glomerular injury in children.
- The findings suggest that SMGN may represent partial resolution of membranous glomerulonephritis.
- SMGN appears to have a favorable prognosis in pediatric patients, with preserved renal function.