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Airway histology before and after BT.
Notes: (A and C) Hematoxylin and eosin and (B and D) trichrome stain. Prominent ASM is seen in this patient with severe asthma, with significantly reduced ASM following treatment with BT. Thin arrow: airway epithelium; thick arrow: ASM.
Abbreviations: BT, bronchial thermoplasty; ASM, airway smooth muscle.
