This article discusses the occurrence of membranous nephropathy (MN) in patients with primary antiphospholipid syndrome (APS), a systemic autoimmune disorder. The study reports on eight patients with biopsy-proven MN and primary APS, who did not have any clinical or immunological characteristics of systemic lupus erythematosus (SLE). The patients presented with various symptoms, including proteinuria, microhematuria, and high blood pressure. The study found that the patients had typical MN on kidney biopsy, with immunofluorescence study revealing IgG and C3 deposits along the glomerular basement membrane. The article concludes that there may be a potential association between APS and MN, but further research is needed to confirm this. [Extracted from the article]