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(A) Multiloculated cystic tissue lined by ciliated pseudostratified epithelium with stroma containing cartilage and seromucinous glands (stain, H&E; original magnification, ×10). (B) Respiratory epithelium overlying stroma containing cartilage (stain, H&E; original magnification, ×60). (C) Stroma containing seromucinous glands (stain, H&E; original magnification, ×60).
