A 50-year-old man presented with nephrotic syndrome. Electron microscopy analysis of a kidney biopsy specimen showed fibrillary glomerulonephritis, a rare glomerular disease, while histological analysis of a liver tumor biopsy confirmed an intrahepatic cholangiocarcinoma. The paraneoplastic nature of fibrillary glomerulonephritis is debated but after curative treatment of the hepatic nodule, remission of nephrotic syndrome was confirmed at 6-, 12- and 24-months follow-up. To our knowledge, this is the first description of a paraneoplastic fibrillary glomerulonephritis associated with a cholangiocarcinoma, supported by complete remission achieved following cancer treatment.
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