A granuloma is characterized by all of the following except______________?
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Answer: D. A reaction of acute inflammation
Explanation
A granuloma is a specific type of chronic inflammatory reaction, not an acute inflammatory reaction. Granulomatous inflammation represents a distinct pattern of chronic immune response to persistent inciting agents. Acute inflammation features neutrophil infiltration, whereas granulomas consist of modified mononuclear phagocytes. Granulomas contain aggregates of epithelioid macrophages surrounded by a collar of lymphocytes and fibroblasts. Infectious agents like Mycobacterium tuberculosis and non-infectious materials like foreign bodies initiate granulomas. Acute inflammation is a rapid, short-lived initial host response mediated primarily by neutrophils and exudation.
Pathologists identify granulomas in tissue biopsies to diagnose chronic conditions like sarcoidosis and fungal infections. Understanding inflammatory sub-types helps clinicians determine whether a disease process is acute or chronic. Chronic granulomatous inflammation can persist for years, leading to significant structural tissue remodeling. Option A is a true statement because granulomas represent a specialized form of chronic inflammation. Option B is correct since granulomas are characterized by the accumulation of modified epithelioid macrophages. Option C is accurate because various infectious microorganisms and foreign bodies can initiate granuloma formation.
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