Changes

==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 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

==Lymphadenitis==

==Lymphadenitis==

oedema or leukocyte (neutrophil) accumulation. Pyogenic organisms can cause abscessation, and necrosis within the node.

oedema or leukocyte (neutrophil) accumulation. Pyogenic organisms can cause abscessation, and necrosis within the node.

Lymphangitis is a more general term refering to an inflammation of the lymphatic system.

Lymphangitis refers to an inflammation of the lymphatic vessels.

==Haemal Lymph Nodes==

==Haemal Lymph Nodes==

   

   

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]]

 

 

 

[[Category:Lymph Nodes]]

[[Category:Lymphoreticular and Haemopoietic Diseases]]