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A foreign-body giant cell is a collection of fused macrophages which are generated in response to the presence of a large foreign body. This is particularly evident with catheters, parasites, or biomaterials that are inserted into the body for replacement or regeneration of diseased or damaged tissues.
Foreign body granuloma formation consists of protein adsorption, macrophages, multinucleated foreign body giant cells (macrophage fusion), fibroblasts, and angiogenesis. It has also been proposed that the mechanical property of the interface between an implant and its surrounding tissues is critical for the host response.
Foreign-body giant cells form when a subject is exposed to a foreign substance. Exogenous substances can include talc or sutures. As with other types of giant cells, epithelioid macrophages fusing together causes these giant cells to form and grow. [13] In this form of giant cell, the nuclei are arranged in an overlapping manner.
Foreign body-type and Touton-type giant cells, calcospherites, cholesterol clefts and hemosiderin deposits are additional findings. [ citation needed ] Hemorrhage , suppuration and necrosis are therefore the initial conditions leading to the xanthogranulomatous response.
Actinic granuloma is distinguished histopathologically by multinucleated foreign body giant cells that phagocytize the degenerated elastic fibers, a process known as elastophagocytosis. At the solar elastosis level, there is no necrobiosis , such as facial necrobiosis lipoidica , or mucinosis , such as GA or sarcoid-like granuloma in the dermis.
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Epithelioid cell granuloma can be defined as specifically and structurally organized collection of epithelioid cells, macrophages, lymphocytes and dendritic cells. Foreign-body granulomas may be considered an organized collection of macrophages, including mere collections of giant cells surrounding inert substances like suture material – the ...
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