title: Pathologic evaluation of canine renal biopsies: methods for identifying features that differentiate immune-mediated glomerulonephritides from other categories of glomerular diseases.
abstract: BACKGROUND
  Human renal biopsies are routinely evaluated with light microscopy (LM) using a panel of histologic stains, transmission electron microscopy (TEM), and immunofluorescence (IF) microscopy to obtain a diagnosis. In contrast, the pathologic evaluation of glomerular disease in veterinary medicine has relied mostly on LM and was of limited utility. To address this problem, recently established veterinary renal diagnostic centers have adopted methods used in human nephropathology for evaluation of renal biopsies. Three broad categories of disease, which have the greatest implications for clinical management of proteinuric dogs, have been established and include amyloidosis, immune complex-mediated glomerulonephritis (ICGN), and non-ICGN.
  
  
  OBJECTIVE
  To demonstrate histopathologic, ultrastructural, and IF findings in renal biopsy specimens that experienced veterinary nephropathologists utilize to make accurate and clinically useful diagnoses in dogs with proteinuric glomerular disease and to provide guidelines for the proper evaluation of renal biopsies.
  
  
  METHODS
  Renal biopsy specimens were routinely examined by LM, IF, and TEM. Samples were reviewed by members of the World Small Animal Veterinary Association Renal Standardization Study Group to identify lesions that were diagnostic for, or suggestive of, the presence of immune complexes (IC) or amyloidosis in all modalities. Ten guidelines for renal biopsy evaluation were formulated.
  
  
  RESULTS
  Each method of investigation contributed important findings that were integrated to make an accurate final morphological diagnosis. The guidelines were validated by an independent group of veterinary pathologists.
  
  
  CONCLUSIONS
  Routine evaluation of renal biopsies with LM, TEM, and IF is feasible and necessary for making accurate, morphologic diagnoses that can be used to guide clinical management of dogs with glomerular disease.
authors.affiliation: Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH.
authors.forename: R E
authors.initials: RE
authors.lastname: Cianciolo
authors.forename: C A
authors.initials: CA
authors.lastname: Brown
authors.forename: F C
authors.initials: FC
authors.lastname: Mohr
authors.forename: W L
authors.initials: WL
authors.lastname: Spangler
authors.forename: L
authors.initials: L
authors.lastname: Aresu
authors.forename: J J
authors.initials: JJ
authors.lastname: van der Lugt
authors.forename: J H
authors.initials: JH
authors.lastname: Jansen
authors.forename: C
authors.initials: C
authors.lastname: James
authors.forename: F J
authors.initials: FJ
authors.lastname: Clubb
authors.forename: G E
authors.initials: GE
authors.lastname: Lees
mesh_terms: D000686:Amyloidosis / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D000818:Animals; D000936:Antigen-Antibody Complex / Q000276:immunology* / Q000648:ultrastructure; D001706:Biopsy / Q000592:standards / Q000662:veterinary*; D032921:Consensus; D004283:Dog Diseases / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology; D004285:Dogs; D005921:Glomerulonephritis / Q000175:diagnosis / Q000276:immunology / Q000473:pathology / Q000662:veterinary*; D046529:Microscopy, Electron, Transmission / Q000662:veterinary; D008856:Microscopy, Fluorescence / Q000662:veterinary; D017410:Practice Guidelines as Topic; D012189:Retrospective Studies
chemical_list: D000936:Antigen-Antibody Complex
keywords: Canine; Glomerulonephritis; Immune complex; Immunofluorescence; Proteinuria; Transmission electron microscopy