A granuloma is an aggregation of macrophages that forms in response to chronic inflammation. This occurs when the immune system attempts to isolate foreign substances that it is otherwise unable to eliminate.[1] Such substances include infectious organisms including bacteria and fungi, as well as other materials such as foreign objects, keratin, and suture fragments.[2][3][4][5]
| Granuloma | |
|---|---|
 | |
| Picture of a granuloma (without necrosis) as seen through a microscope on a glass slide: The tissue on the slide is stained with two standard dyes (hematoxylin: blue, eosin: pink) to make it visible. The granuloma in this picture was found in a lymph node of a patient with a Mycobacterium avium infection. | |
| Specialty | Pathology |
Contents
- 1Definition
- 2Diseases with granulomas
- 2.1Tuberculosis
- 2.2Leprosy
- 2.3Schistosomiasis
- 2.4Histoplasmosis
- 2.5Cryptococcosis
- 2.6Cat-scratch disease
- 2.7Rheumatic fever
- 2.8Sarcoidosis
- 2.9Crohn's disease
- 2.10Listeria monocytogenes
- 2.11Leishmania spp.
- 2.12Pneumocystis pneumonia
- 2.13Aspiration pneumonia
- 2.14Rheumatoid arthritis
- 2.15Granuloma annulare
- 2.16Foreign-body granuloma
- 2.17Childhood granulomatous periorificial dermatitis
- 3Granulomas associated with vasculitis
- 4Etymology
- 5See also
- 6References
- 7External links
https://en.wikipedia.org/wiki/Granuloma
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