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In cats following the inroduction of widespread vaccination against 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 vaccination against 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 is  now associated with FeLV.
 
Only 10% of lymphoma cases in cats is  now associated with FeLV.
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A staging system is used for lymphoma (Owen, 1980):
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* Stage I - Involvement limited to a single node or lymphoid tissue in a single organ (excluding bone marrow)
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* Stage II - Involvement of many lymph nodes in a regional area (+/- tonsils)
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* Stage III - Generalised lymph node involvement
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* Stage IV - Liver and/or spleen involvement (+ stage III)
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* Stage V - Manifestations in the blood and involvement of bone marrow and/or other organ systems (+/-stages I-IV)
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Each stage is then subclassifed as a) without systemic signs or b) with systemic signs.
      
==Signalment==
 
==Signalment==
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