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Endobronchial ultrasound-guided transbronchial needle aspiration was used to collect a lymph node specimen. (a) Hematoxylin and Eosin staining shows a noncaseating epithelioid cell granuloma. (b) Immunohistochemical staining with a specific monoclonal antibody against Propionibacterium acnes lipoteichoic acid (PAB antibody) shows positive reaction products (black arrows) in the granuloma.
