Epithelioid and giant cells within a granuloma originate from_____________?
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Answer: D. Monocyte
Explanation
Epithelioid cells and multinucleated giant cells within a granuloma are derived from the differentiation and fusion of monocytes and macrophages. Monocytes recruited from the bloodstream migrate into tissues and transform into specialized epithelioid histiocytes. Multiple activated macrophages can fuse together to form characteristic multinucleated giant cells in chronic inflammation. Monocytes are circulating white blood cells that mature into tissue macrophages upon entering inflammatory sites. Epithelioid cells feature abundant pink cytoplasm and resemble epithelial cells while retaining macrophagic functions. Granulomas represent chronic inflammatory structures coordinated by interactions between macrophages and lymphocytes.
Histological identification of epithelioid macrophages helps pathologists diagnose chronic granulomatous infections. T lymphocytes secrete cytokines like interferon-gamma that stimulate monocytes to form these specialized granuloma cells. Granulomatous lesions wall off agents that resist standard acute inflammatory clearance mechanisms. Option A is incorrect because T cells provide regulatory cytokine signals rather than differentiating into epithelioid cells. Option B is wrong since B cells differentiate into plasma cells producing antibodies rather than forming giant cells. Option C is incorrect because plasma cells secrete immunoglobulins and do not fuse to create granulomatous giant cells.
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