Figure 4.

The pathohistological findings of the resected lung tissue. (A) The lesions appeared to be regionally distributed and included widened alveolar septae, lymphocytic infiltrates, vascular proliferation, anapetia, intra-alveolar haemorrhage, interstitial fibrosis and massive fibrinoid necrosis (haematoxylin & eosin staining, ×50); (B) hyaline membrane formation (green arrows) was observed (haematoxylin & eosin staining, ×400); (C) interstitial vascular proliferation and thrombi within the vascular lumina (green arrow) were documented (haematoxylin & eosin staining, ×100); and (D) emphysema and pulmonary bulla formation were also observed (haematoxylin & eosin staining, ×50).