Fibrillary Glomerulonephritis in a Patient With Sjögren's Syndrome and Primary Biliary Cholangitis: A Case Report and Literature Review.

Fibrillary glomerulonephritis (FGN) is a rare glomerular disease characterized by the deposition of fibrils within the mesangium and glomerular basement membrane. Most cases are idiopathic, but it can be linked to autoimmune diseases, neoplasms, and infections. There is limited evidence on the best treatment approach, and many patients progress to end-stage kidney disease.