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Granuloma annulare is a skin disease of unknown cause in which granulomas are found in the dermis of the skin, but it is not a true granuloma. Typically, a central zone of necrobiotic generation of collagen is seen, with surrounding inflammation and mucin deposition on pathology.
On histopathological examination, a biopsy will show leukocytoclastic vasculitis with necrotic changes and granulomatous inflammation (clumps of typically arranged white blood cells) on microscopy. These granulomas are the main reason for the name granulomatosis with polyangiitis, although it is not an essential feature.
Some cases are due to silicone injection (Silicone-induced granulomatous inflammation) or other foreign body reactions. [2] [3] Idiopathic granulomatous mastitis (IGM) is defined as granulomatous mastitis without any other attributable cause such as those above mentioned.
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]
Eosinophilic granulomatosis with polyangiitis (EGPA), formerly known as allergic granulomatosis, [3] [4] is an extremely rare autoimmune condition that causes inflammation of small and medium-sized blood vessels in persons with a history of airway allergic hypersensitivity . [5] It usually manifests in three stages.
Examples of granulation tissue can be seen in pyogenic granulomas and pulp polyps. Its histological appearance is characterized by proliferation of fibroblasts and thin-walled, delicate capillaries (angiogenesis), and infiltrated inflammatory cells in a loose extracellular matrix.
The inflammatory process that creates these cells often leads to a foreign body granuloma. The human body goes through several steps when exposed to foreign biomaterial including acute and chronic inflammation, and formation of new tissue and a fibrous capsule along the surface of the implantation. [1]
Palisaded neutrophilic and granulomatous dermaititis is associated with subacute bacterial endocarditis, [4] ledipasvir/sofosbuvir, [5] allopurinol, [6] Hodgkin’s and non-Hodgkin’s lymphoma, [4] chronic myelomonocytic leukemia, [7] ulcerative colitis, [8] Takayasu arteritis, [4] systemic vasculitis, [8] systemic lupus erythematosus (SLE), [9] sarcoidosis, [10] rheumatoid arthritis, [11 ...
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