Abstract
A 62-year-old woman with nephrotic syndrome underwent a renal biopsy. Under light microscopy, the biopsy findings included lobulation and enlargement of glomeruli, occasional thickening of glomerular capillary walls, and narrowing of the capillary lumen by swollen endothelial cells. Congo red staining was negative for amyloid. No significant intraglomerular fibrin deposition was found by phosphotungstic acid hematoxylin staining. Immunofluorescence microscopy showed no deposition of immunoglobulin G, A, or M; no κ or λ light chains; and no C3 or C1q. Electron microscopy revealed distinctive subendothelial and mesangial fibrillar deposits, mesangial cell interposition, and swelling and vacuolization of endothelial cells resulting in capillary lumen narrowing. Although some curvilinear fibrillar deposits mimicked the bundles of type III collagen fibers seen in collagenofibrotic glomerulopathy, neither glomerular deposition of type III collagen nor elevation of serum procollagen III peptide was noted. This glomerulopathy does not fulfill any known disease entities with non-amyloid non-immunoglobulin-derived organized glomerular deposits.
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Acknowledgments
The authors thank Dr. Akira Michibe and Dr. Sayaka Ishigaki for their clinical works, Mr. Masanori Handa for providing technical assistance with immunohistochemistry and Mr. Isao Ohta for providing technical assistance with electron microscopy.
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Yamamoto, T., Togawa, A., Eguchi, M. et al. Glomerulopathy with distinctive fibrillar deposits but lacking glomerular deposition of type III collagen. CEN Case Rep 5, 163–167 (2016). https://doi.org/10.1007/s13730-016-0217-2
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DOI: https://doi.org/10.1007/s13730-016-0217-2