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(A) A cystic space filled by pus was documented, with the wall being composed of inflammatory cells and organizing pneumonia (hematoxylin and eosin ×40). (B) Remnants of the bronchial epithelium with squamous metaplasia were seen to inconsistently cover cystic dilations, alongside hemosiderin accumulation (inset) (hematoxylin and eosin ×100, inset ×200).
