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Answer: C Fibrillary glomerulonephritis is a rare disease affecting less than 1% of all native kidney biopsies and is due to fibrillary deposits of immunoglobulin that by electron microscopy are randomly arranged fibrils of approximately 18-20 nm in diameter. Clinically patients will present with proteinuria and hematuria. Histologically it can show several patterns within glomeruli including mesangial proliferative, membranoproliferative, or even a crescentic pattern of glomerular injury. Positive staining with the DNAJB9 stain is extremely useful in identifying this disease as it is around 98% sensitive and 99% specific for Fibrillary GN. Associations with Fibrillary GN include autoimmune disease, infection...