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==Description==   

==Description==   

Lymphoma is caused by malignant clonal expansion of lymphoid cells and most commonly arises from lymphoid tisses including the [[Bone Marrow|bone marrow]], [[Thymus|thymus]], [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] and [[Spleen - Anatomy & Physiology|spleen]]. Lymphoma is documented to be the most common haematopoietic [[Neoplasia - Pathology|neoplasm]] in dogs.  

Lymphoma is caused by malignant clonal expansion of lymphoid cells and most commonly arises from lymphoid tissues including the [[Bone Marrow|bone marrow]], [[Thymus|thymus]], [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] and [[Spleen - Anatomy & Physiology|spleen]]. Lymphoma is documented to be the most common haematopoietic [[Neoplasia - Pathology|neoplasm]] in dogs.  

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 - Anatomy & Physiology|Alimentary]], cutaneous, [[Mediastinum - Anatomy & Physiology|mediastinal]] and extranodal sites are less common. Additionally the majority of lymphoma cases in dogs are of the B-cell immunophenotype.  

In cats following the inroduction of widespread vaccination against [[Feline Leukaemia Virus|FeLV]] testing and [[vaccination]] the most common type of lymphoma affecting cats is alimentary when previously it had been mediastinal and multicentric forms.

In cats following the inroduction of widespread [[Feline Leukaemia Virus|FeLV]] testing and [[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.