Fig. 3.

Bronchoscopic and histologic imaging.

Bronchoscopy showing that the orifice of the left-lingular lobe bronchus is occluded by mucoid impaction accompanied by mucosal edema 2 months after referral (May 2019: Bronchoscopy #1) (a). The mucoid impaction has disappeared 4 months after treatment with predonisolone. (September 2019: Bronchoscopy #2) (b). Bronchoscopic findings showing mucoid impaction in the orifice of the left B3b accompanied by mucosal edema on recurrence (September 2021: Bronchoscopy #3) (c). Hematoxylin and eosin staining showing that the biopsies from the mucoid impaction contain abundant eosinophils and Charcot–Leyden crystals (arrowhead) (May 2019) (d). Filamentous fungal hyphae are noted on the Grocott-stained specimen (e).

Scale bar = 20 μm.