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:'''Type of lymphocyte''' - [[T cells|T-cell]], [[B cells|B-cel]] or [[Natural Killer cells|NK-cell]]
:'''Type of lymphocyte''' - [[T cells|T-cell]], [[B cells|B-cel]] or [[Natural Killer cells|NK-cell]]
:'''Time scale''' - Acute or Chronic
:'''Time scale''' - Acute or Chronic
'''Prevalence'''
Order of prevalence in UK: cats, dogs, cattle, pigs and sheep. In the cat and ox, viral agents have been identified as the causal agents.
* FeLV is an important cause of lymphoma in the cat.
** 70% of cats with lymphoma will test positive for FeLV.
** FeLV also causes a number of non-neoplastic diseases.
*** Anaemia.
*** Leukopaenia.
*** Thymic atrophy.
* Cattle suffer both lymphosarcoma and leukosis in a variety of cytological forms.
** Bovine lymphoma is caused by [[Bovine Leukaemia Virus]] (BLV).
*** A retrovirus.
*** There is a juvenile form of bovine lymphoma seen in young cattle which is not associated with BLV.
===Dog===
===Dog===
Lymphoma is one of the prevalent neoplasms in the dog. The incidence is about 28 per 100,000 dogs. Blood of affected dogs shows neither a relative nor absolute increase in the number of lymphocytes until the late stages of the disease. When this stage is reached, poorly differentiated cells may appear in the blood.
In the dog, '''multicentric''' lymphoma is most common representing 80% of cases. Alimentary, cutaneous, mediastinal and extranodal sites are less common. Additionally the majority of lymphoma cases in dogs are of the B-cell immunophenotype.
In the dog, '''multicentric''' lymphoma is most common representing 80% of cases. Alimentary, cutaneous, mediastinal and extranodal sites are less common. Additionally the majority of lymphoma cases in dogs are of the B-cell immunophenotype.