Lymphosarcoma in three pigs in a multiple-site production system in Ontario

Received: May 26, 2004 Accepted: September 15, 2004 Neoplastic diseases have not been widely studied in pigs, although prevalence in slaughter animals has been recorded in several countries in the past four decades. Since most swine are slaughtered at 6 months of age or younger, the most common tumors diagnosed are those that commonly occur in young animals, ie, lymphosarcoma, nephroblastoma, and melanoma.1 Lymphosarcoma is a general term applied to malignant neoplastic disorders of lymphoid tissue.2 Malignant tumors often grow rapidly and are invasive, but may or may not be metastatic.