Reactive Lymphoid Hyperplasia
Reactive Lymphoid Hyperplasia Definition Enlargement of lymph nodes or other lymphoid organs as a consequence of hyperplasia of some or all of the cellular components, reflecting stimulation of the lymphoid…
Introduction
Introduction Lymphadenopathies are reactive processes of lymph nodes in response to a variety of exogenous and endogenous stimulants. The etiology and pathogenesis of many lymphadenopathies are still unknown; thus, the…
Filaria Lymphadenitis
Filaria Lymphadenitis Definition Lymphadenitis caused by infection with filarial parasites. Epidemiology Filaria organisms are nematode worms of various species with a distinct geographic distribution. Wuchereria bancrofti is prevalent in Africa…
Leishmania Lymphadenitis
Leishmania Lymphadenitis Definition Lymphadenitis caused by infection with protozoa of the genus Leishmania. Epidemiology Leishmaniasis is endemic in Asia, South America, Africa, where it is caused by L. donovani, and…
Toxoplasma Lymphadenitis
Toxoplasma Lymphadenitis Definition Lymphadenitis caused by infection with the protozoan Toxoplasma gondii. Synonym Piringer-Kuchinka lymphadenopathy. Epidemiology Toxoplasmosis is a common parasitic disease worldwide. The infection, which is mostly asymptomatic, is…
Introduction
Introduction Parasitic protozoa are major causes of disease, particularly in developing countries. They do not secrete exotoxins but are able, according to species, to colonize the gastrointestinal tract, invade the…
Pneumocystis Lymphadenitis
Pneumocystis Lymphadenitis Definition Lymphadenitis caused by infection with the fungus Pneumocystis jiroveci. Synonym Pneumocystis jiroveci (formerly P. carinii) infection of lymph nodes. Epidemiology Although P. jiroveci organisms are ubiquitous in…
Coccidioidomycosis Lymphadenitis
Coccidioidomycosis Lymphadenitis Definition Lymphadenitis caused by infection with the fungus Coccidioides immitis. Epidemiology Coccidioidomycosis is endemic in the southwestern United States, particularly the San Joaquin Valley in southern California, Arizona,…
Histoplasma Lymphadenitis
Histoplasma Lymphadenitis Definition Lymphadenitis caused by infection with the fungus Histoplasma capsulatum. Epidemiology Histoplasmosis is endemic in Central America and in the river valleys of the midwestern and south-central United…
Cryptococcus Lymphadenitis
Cryptococcus Lymphadenitis Definition Lymphadenitis caused by infection with Cryptococcus neoformans. Epidemiology Cryptococcus neoformans has worldwide distribution. It is found in aged pigeon feces and bird nests, where it remains viable…
