Comparison between light and electron microscopy in canine and feline renal pathology: a preliminary study

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The aim of this study is to compare the accuracy and clinical use of light and transmission electron microscopy in detecting the early stages of renal pathologies in domestic animals. We examined 30 samples of renal tissue from cats and dogs referred to the Veterinary Hospital of the Department of Animal Pathology for different systemic diseases. The progressions of the kidney pathologies were classified using the scheme system proposed by the International Renal Interest Society. All samples were submitted for conventional histology and ultrastructural examination. Our study shows that electron microscopy is necessary to complete the histological examinations, especially to define early stages of kidney diseases (minimal changes disease, epithelial tubular pathologies, tubular basement membrane and glomerular basement membrane changes). Electron microscopy can be more accurate in defining the level of focal lesion, and permits discrimination between different clinical and pathological alterations such as fibrillary deposits. In conclusion, transmission electron microscopy associated with clinical, histological, histochemical and immunological examinations, is an essential method for diagnosis and prognosis of renal disease.

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