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Equine leukaemic lymphoma is a rare disease of the haematopoetic tissue. It results from neoplastic degradation of B- and T-lymphocytes and their occurrence in the blood. Clinical signs are often unspecific and include chronic weight loss, ventral oedema at the thorax and abdomen and regional lymphadenopathy. Horses are often presented late in the course of the disease and therapy is rarely successful. This review summarizes the clinical pathologic findings of equine leukaemic lymphoma and the findings of laboratory testing and other diagnostic measures, and presents treatment options described in the literature.