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:'''Time scale''' - Acute or Chronic
:'''Time scale''' - Acute or Chronic
'''Prevalence'''
Order of '''prevalence''' in UK is cats, dogs, cattle, pigs and sheep. In the cat and ox, viral agents have been identified as the causal agents.
===Dog===
===Dog===
===Cat===
===Cat===
[[FeLV]] is an important cause of lymphoma in the cat. Following the introduction of widespread [[Feline Leukaemia Virus|FeLV]] testing and [[vaccines|vaccination]] the most common type of lymphoma affecting cats is '''alimentary''' when previously it had been mediastinal and multicentric forms.
Only 10% of lymphoma cases in cats are now associated with FeLV.
Only 10% of lymphoma cases in cats are now associated with FeLV, whereas it used to be 70%.
The alimentary form affects the mesenteric lymph nodes, intestine, [[Liver - Anatomy & Physiology|liver]], spleen , and potentially the kidney. The thymic form presents as a thymic mass, also in the mediastinal lymph nodes. The pleural lymph nodes and the liver may potentially be affected. Multicentric form is found in the peripheral and deep lymph nodes, liver and spleen. The kidney may sometimes be affected. There is also a renal form affecting kidneys and other abdominal organs and leukaemic form affecting the bone marrow alone, this form is rare.
===Horse===
===Horse===
In horses, lymphoma is the most common haemopoietic neoplasm. It has been characterised into four main forms: '''alimentary, cutaneous, mediastinal and multicentric'''.
In horses, lymphoma is the most common haemopoietic neoplasm. It has been characterised into four main forms: '''alimentary, cutaneous, mediastinal and multicentric''', however, it takes mainly the alimentary form.
===Cattle===
===Cattle===
Cattle suffer both lymphosarcoma and leukosis in a variety of cytological forms. Bovine lymphoma is caused by [[Bovine Leukaemia Virus]] (BLV). There is a [[Sporadic Bovine Leukosis|juvenile form of bovine lymphoma]] seen in young cattle which is not associated with BLV.
===Pig===
Porcine disease is mainly multicentric affecting lymph nodes, liver and spleen.
===Sheep===
Ovine lymphoma is uncommon. It may be multicentric or thymic.
==Signalment==
==Signalment==
===Dog===
===Dog===
Affected dogs have a wide age range, most are middle-aged however young
Affected dogs have a wide age range, most are middle-aged however young animals can be affected, 80% of cases affect the 5 to 11 year old age group. There may also be a male predilection.
animals can be affected. There may also be a male predilection.
===Cat===
===Cat===
[[Category:Neoplasia]]
[[Category:Neoplasia]]
[[Category:Splenic Neoplasia]]
[[Category:Splenic Neoplasia]]