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A case of sporadic lymphosarcoma in a cow is described. The animal showed a tumorous mass in the area of the right orbita accompanied by conjunctival oedema. Clinical investigation showed an enlargement of a number of internal and external lymph nodes. Haematological and clinicochemical investigations revealed no alterations besides a slight shift to the right in the white blood picture. Blood serum was negative for antibodies directed against bovine leucosis virus. Necropsy showed leucotic and tumorous alterations in a number of organs.