Histopathology remains an important tool for ruminant disease diagnostic investigations. Some ruminant diseases require histopathology to make a definitive diagnosis. Clinical history, proper tissue sampling and handling, and proper fixation all increase the efficiency of a histopathologic examination and the likelihood of an accurate diagnosis. This article discusses some of the main organ systems of ruminants and highlights common ruminant diseases encountered by diagnosticians where histopathology is particularly important. Where applicable, correlative gross lesions, special considerations regarding tissue sampling, and histologic report interpretation are discussed.
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