title: Glomerulonephropathy with amyloid-stain-negative microfibrillar glomerular deposits.
abstract: A 44-year-old man demonstrated proteinuria, microhematuria and renal dysfunction during the course of hyperthyroidism. Neither cryoglobulinemia nor paraproteinemia including light chains was found. No systemic signs suggestive of amyloidosis appeared. Histological findings showed a diffuse mesangial matrix increase with slight mesangial proliferation and diffuse granular depositions of IgG, IgA, C3, C4, Clq, kappa and lambda light chains. Ultrastructurally, microfibrils of about 20 nm in width were seen to be deposited diffusely in mesangial areas and in glomerular basement membranes. Congo red and thioflavin T staining were negative. These findings support the possible existence of a specific glomerular disease different from amyloidosis.
authors.affiliation: Department of Medicine, Kitasato University School of Medicine, Sagamihara, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Fujii
authors.forename: A
authors.initials: A
authors.lastname: Kurokawa
authors.forename: M
authors.initials: M
authors.lastname: Kamiyama
authors.forename: H
authors.initials: H
authors.lastname: Miyazawa
mesh_terms: D000328:Adult; D001485:Basement Membrane / Q000648:ultrastructure; D003165:Complement System Proteins / Q000032:analysis; D005455:Fluorescent Antibody Technique; D005920:Glomerular Mesangium / Q000648:ultrastructure; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D007678:Kidney Glomerulus / Q000276:immunology / Q000648:ultrastructure*; D008297:Male; D009404:Nephrotic Syndrome / Q000276:immunology / Q000473:pathology*
chemical_list: D007136:Immunoglobulins; D003165:Complement System Proteins