Figure 3.

Microscopic features of the patient's lung upper lobe. Under low power microscope, some alveolar septum of apicoposterior segment of upper lobe(from where labeled “a” in Figure 2 ) had more lymphocyte and plasmocyte infiltrated, alveolar wall was mild broadening, but absent evident of fibrous hyperplasia which looks like pattern of NSIP cellular type (A); Some alveolar wall had fibre hyperblastosis obviously , a few collagen deposited and lymphocyte infiltrated as picture of NSIP mix type (B) and fibrotic type (C) ; The fiber interval of subpleural aera of anterior segment (from where labeled “b” in Figure 2 ) was thickening clearly, bronchiole epithelium had metaplasia and cystic fibrous gas cavity was formed (*), several cystic wall had small fibroblast foci (solid arrow), The appearance was extremely like UIP (D). ( H&E stain, Magnification:HE×40).