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===== Classification=====
−* '''Cytological classification'''.
−** Well differentiaed (lymphocytic)
−*** The malignant cells represent normal lymphocytes, although in excessive numbers.
−** Poorly differentiated (lymphoblastic).
−*** The malignant cells represent atypical lymphocytic cells with lymphoblastic characteristics.
−* '''Tumour distribution'''
−** Nodular/ follicular.
−*** A well organised pattern of slow growth.
−*** No metastasis.
−*** Are of the B-lymphocyte type.
−** Diffuse.
−*** Result in effacement of normal lymphoid architecture by a very homogeneous population of lymphoid cells.
−* '''Anatomical classification'''
−** Thymic.
−** Only the [[Thymus - Anatomy & Physiology|thymus]].
−** Alimentary.
−*** Gut and associated lymphoid tissue.
−** Multicentric.
−*** Widespread involvement of lymph nodes.
−** Cutaneous lymphoma.
−*** Usually presents as generalised skin disease, but is a malignant transformation of T cells with a propensity for pithelial sites
−* '''Type of lymphocyte'''
−** T-cell.
−** B-cell.
−** NK-cell.
−* '''Time scale'''
−** Acute.
−** Chronic.
[[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.
+
+'''Classification'''
+:'''Cytological classification'''
+::Well differentiaed (lymphocytic) - The malignant cells represent normal lymphocytes, although in excessive numbers.
+::Poorly differentiated (lymphoblastic) - The malignant cells represent atypical lymphocytic cells with lymphoblastic characteristics.
+:'''Tumour distribution'''
+::Nodular/ follicular - A well organised pattern of slow growth, no metastasis, they are of the B-lymphocyte type
+::Diffuse - Result in effacement of normal lymphoid architecture by a very homogeneous population of lymphoid cells.
+:'''Anatomical classification'''
+::Thymic - Only the [[Thymus - Anatomy & Physiology|thymus]] is affected.
+::Alimentary - Gut and associated lymphoid tissue affected.
+::Multicentric - Widespread involvement of lymph nodes.
+::Cutaneous lymphoma - Usually presents as generalised skin disease, but is a malignant transformation of T cells with a propensity for pithelial sites.
+:'''Type of lymphocyte''' - [[T-cell]], [[B-cel]] or [[NK-cell]]
+:'''Time scale''' - Acute or Chronic
===Dog===
===Dog===
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−=====Prevalence=====
=====Prevalence=====