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A 37-year-old man presents with a cough, fever, night sweats, and weight loss. A...
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A 37-year-old man presents with a cough, fever, night sweats, and weight loss. A chest x-ray reveals irregular densities in the upper lobe of his right lung. Histologic sections from this area reveal groups of epithelioid cells and a few scattered giant cells. At the centre of these groups of epithelioid cells are areas of caseous necrosis. What is the source of these epithelioid cells?
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