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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, thymus, lymph nodes and spleen. Lymphoma is documented to be the most common haematopoietic neoplasm in dogs.  

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.  

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.