HEMATOPOIETIC NEOPLASMS OF SLAUGHTER ANIMALS
ARMED FORCES INST OF PATHOLOGY WASHINGTON DC
Pagination or Media Count:
Hematopoietic neoplasms observed in cattle, pigs, sheep, goats, and horses slaughtered in federally inspected establishments of the United States are a malignant lymphomas b thymomas c mastocytomas and d granulocytic sarcomas malignant myelomas. Malignant lymphomas are the most frequently observed hematopoietic neoplasms of animals of all 5 species. Except for minor variations in distributions of neoplastic infiltrates, morphologic patterns are similar in all 5 species and resemble those seen in lymphomas of other animals and man. Thymomas occur in animals of all 5 species. They are encapsulated thoracic masses -- composed of mixtures of reticular and lymphocytic cells -- characteristically benign and rarely metastatic. Goats appear to have a relatively high incidence of thymomas compared to animals of the other 4 species. Mastocytomas, rare in slaughter animals were found only in cattle and pigs. Granulocytic sarcomas malignant myelomas, also rare in slaughter animals, were observed only in cattle and pigs. Distribution of infiltrates was characteristic of granulocytic sarcoma rather than of leukemia. The outstanding characteristic was the green color of gross organs.
- Animal Husbandry and Veterinary Medicine