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Nasopharygenal biopsy. (A) The nasopharyngeal tissue shows dense polymorphous inflammatory cell infiltrates composed of mature lymphocytes, plasma cells, histiocytes, eosinophils and neutrophils. There are few multinucleated giant cells which represent granulomatous component of the disease. (B) Granulomatous inflammation involving vessel wall and lumen (vasculitis) with necrosis is evident.
