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Membranous glomerulonephritis with crescents.

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Membranous glomerulonephritis (MGN) and necrotizing and crescentic glomerulonephritis (NCGN) co-occurrence is rare outside lupus. Secondary MGN is frequent in ANCA-positive NCGN, suggesting potential shared causes in non-lupus kidney disease.

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Area of Science:

  • Nephrology
  • Pathology
  • Immunology

Background:

  • The simultaneous presence of membranous glomerulonephritis (MGN) and necrotizing and crescentic glomerulonephritis (NCGN) is uncommon in kidney biopsies, typically seen in lupus nephritis.
  • The etiological relationship between these distinct glomerular pathologies in non-lupus settings remains poorly understood.

Purpose of the Study:

  • To investigate the clinical and pathological characteristics of patients with coexisting MGN and NCGN in native kidney biopsies, excluding lupus nephritis.
  • To explore the potential for secondary MGN and identify possible common underlying causes.

Main Methods:

  • A retrospective review of 13 non-lupus patients with biopsy-proven combined MGN and NCGN.
  • Analysis of pathological findings, clinical presentation, treatment, and outcomes.
  • Immunofluorescence studies including IgG subclasses and phospholipase A2 receptor (PLA2R) in select cases.

Main Results:

  • Seven of 13 patients exhibited features suggestive of secondary MGN.
  • Secondary MGN was more prevalent in ANCA-positive NCGN cases (5/8) compared to the general MGN population.
  • Treatment responses varied, with durable responses in seven patients and progression to end-stage renal disease in four.

Conclusions:

  • Secondary MGN is observed more frequently in ANCA-positive NCGN than typically reported.
  • While a direct causal link was not definitively established, findings suggest shared etiologies in some cases, such as immune complex disease, drug reactions, or paraneoplastic syndromes.