Figure 1: Chest X-ray and high-resolution CT showed large consolidation shadow in the left lower lung(A,B,C).Obvious hyperemia of bronchial mucosa and nodular protrusion on the surface of mucosa (D). Longitudinal fold change of subbronchiolar mucosa and mucus plug obstruction in the lesion site of bronchial subbranch (E).The subbronchiolar mucosa looked pale, and necrotic detachment of bronchial epithelial mucosa blocked lumen opening(F).The subbronchiolar mucosa were pale in color and occluded with concave center and peripheral radial hyperplasia in the occluded part(G,H). Plastic mucus plug taken by cell brush under bronchoscope(I).