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==Reactive Lymph Nodes==
==Reactive Lymph Nodes==
Lymph nodes demonstrate hyperplasia as an immunological response to antigens; cells proliferate in the cortex of the node and germinal centre activity results in multiplication of cells in the thymus-dependent area (paracortex). Newly formed [[B cell differentiation|plasma cells]] accumulate in the medullary cords and macroscopically a bulging white cortex is seen which may almost obliterate the medulla
Lymph nodes demonstrate hyperplasia as an immunological response to antigens; cells proliferate in the cortex of the node and germinal centre activity results in multiplication of cells in the thymus-dependent area (paracortex). Newly formed [[B cell differentiation|plasma cells]] accumulate in the medullary cords and macroscopically a bulging white cortex is seen which may almost obliterate the medulla
Secondary tumours; the lymph nodes are often involved in the spread of tumours by extension or metastasis and are usually carcinomas
Secondary tumours; the lymph nodes are often involved in the spread of tumours by extension or metastasis and are usually carcinomas
[[Category:Lymph Node Responses in Disease]]
{{Learning
|full text = [http://www.cabi.org/cabdirect/FullTextPDF/2010/20103277069.pdf ''' Cytological evaluation of canine lymphadenopathies - a review of 109 cases.''' Marudhai Thangapandiyan; Chidambaram Balachandran; Veterinarski Fakultet Sveučilišta u Zagrebu (Faculty of Veterinary Medicine, University of Zagreb), Zagreb, Croatia, Veterinarski Arhiv, 2010, 80, 4, pp 499-508, 23 ref.]
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{{Jim Bee 2007}}
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[[Category:Lymph Nodes]]
[[Category:General Pathology]]
[[Category:Lymphoreticular and Haemopoietic Diseases]]