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Histologic analyses revealed eosinophilic glomerular deposits, which had segmental positive immunolabeling with anti-type III collagen antibodies by immunohistochemistry. These deposits were observed in approximately 70% of glomeruli in case 1, 50% in case 2, and 95% in case 3. An ultrastructural examination confirmed that the deposits were comprised of irregularly arranged collagen fibrils with periodic transverse striations mixed with fibrils of a smaller diameter. Additionally, similar deposits were noted in the walls of arterioles in the spleen of case 3. 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