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Feline alimentary lymphoma: a guide to cytological and histopathological diagnosis for the general practitioner

Lymphoma is the most common neoplasm in domestic cats and alimentary lymphoma is now the most common anatomical site. This article aims to highlight and explain the shift from FeLV-positive multicentric to FeLV-negative alimentary lymphomas, and to explain the cytological and histopathological methods of diagnosing and classifying alimentary lymphoma, in a way that is useful to the general practitioner. Alimentary lymphoma (AL) in felines can be histologically graded into low-, intermediate- and high-grade lymphoma. Low-grade AL has a fair prognosis, while intermediate- and high-grade have poorer prognoses. Transmural invasion by neoplastic lymphocytes also carries a poor prognosis. Large granular lymphocyte lymphoma is a histological sub-classification determined by cell morphology, can be of any grade, and the prognosis is very poor.