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==Introduction==   

==Introduction==   

[[Image:tonguelymphoma.gif|right|thumb|125px|<small><center>Tongue Lymphoma - a recognised entity (Courtesy of Alun Williams (RVC))</center></small>]]

[[Image:tonguelymphoma.gif|right|thumb|200px|<small><center>Tongue Lymphoma - a recognised entity (Courtesy of Alun Williams (RVC))</center></small>]]

[[Image:Lymphoma in nasal cavity.jpg|right|thumb|125px|<small><center>Lymphoma in nasal cavity (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

[[Image:Lymphoma in nasal cavity.jpg|right|thumb|200px|<small><center>Lymphoma in nasal cavity (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

[[File:Lymphoma in golden.JPG|right|thumb|200px| Lymphoma in a Golden Retriever (Wikimedia Commons)]]

[[File:Lymphoma in golden.JPG|right|thumb|200px| Lymphoma in a Golden Retriever (Wikimedia Commons)]]

Lymphoma is caused by malignant clonal expansion of lymphoid cells and most commonly arises from lymphoid tissues including the [[Bone Marrow|bone marrow]], [[Thymus - Anatomy & Physiology|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 - Anatomy & Physiology|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.