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A granuloma is an aggregation of macrophages (along with other cells) 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 ]
The disease is still sometimes confused with lethal midline granuloma and lymphomatoid granulomatosis, both malignant lymphomas. [ 34 ] The full clinical picture was first presented by Friedrich Wegener (1907–1990), a German pathologist , in two reports in 1936 and 1939, leading to the eponymous name Wegener's granulomatosis or Wegener ...
Chronic granulomatous disease (CGD), also known as Bridges–Good syndrome, chronic granulomatous disorder, and Quie syndrome, [1] is a diverse group of hereditary diseases in which certain cells of the immune system have difficulty forming the reactive oxygen compounds (most importantly the superoxide radical due to defective phagocyte NADPH oxidase) used to kill certain ingested pathogens. [2]
The foam cells of monocyte/macrophage origin are positive for KP1, HAM56, CD11b and CD68 as pointed out by Nakashiro et al. in xanthogranulomatous cholecystitis). [20] Many T lymphocytes were identified by these authors positive to CD4 and CD8. Macrophages and T lymphocytes demonstrated a marked expression of HLA-DR antigen.
Annular elastolytic giant-cell granuloma (also known as "Giant cell elastophagocytosis," [1] "Meischer's granuloma," [2] "Miescher's granuloma of the face" [1]) is a cutaneous condition characterized histologically by a dermal infiltrate of macrophages.
Through the release of Interleukin 4 (IL-4) and Interleukin 13 (IL-13) by TH2, or T helper cells, and mast cells, these macrophages can fuse to form foreign body giant cells. [1] [4] The macrophages are initially attracted to the injury/infection site through a variety of chemoattractants like growth factors, platelet factors, and interleukins. [4]
They are formed by the fusion of epithelioid cells (macrophages), and contain nuclei arranged in a horseshoe-shaped pattern in the cell periphery. [1] Although traditionally their presence was associated with tuberculosis, they are not specific for tuberculosis or even for mycobacterial disease. In fact, they are found in nearly every form of ...
The disease also tends to appear mainly in dogs aged under 3 years. [13] Eosinophilic granuloma lesions in dogs primarily consists of eosinophils with addition of various cell subtypes such macrophages, neutrophils, plasmocytes, lymphocytes, mast cells and many others. [13]