Figure 1 Schematic diagram of different types of airway-invasive pulmonary aspergillosis. (A) Type I: mainly invading the trachea and the main bronchus and the wall of the trachea, and the main bronchus is thickening. (B) Type II mainly involves the lobular and segmental bronchi. In the early stages of type II, only the bronchial wall is thickened. In the late stage of follow-up, type IIa or type IIb can be found. Type IIa is associated with obvious bronchiectasis, and type IIb mainly infiltrates along the periphery of the bronchus without obvious bronchiectasis. (C) Type III involves the bronchioles and pulmonary parenchyma, manifested as peripheral bronchioles and acinar nodules. As the course of the disease progresses, the nodules fuse to form patches of consolidation, with small cavities often appearing inside.