FIGURE 2.

Histological patterns of interstitial pneumonia seen in interstitial pneumonia with autoimmune features. a) Fibrotic non-specific pneumonia (NSIP): there is diffuse uniform interstitial fibrosis associated with a mild patchy non-specific chronic inflammatory cell infiltrate. b) Organising pneumonia (right side) with progression to interstitial fibrosis (left side): buds of granulation tissue merge with established fibrosis. c) Lymphoid interstitial pneumonia (LIP) overlapping with cellular NSIP: in this field, the right-hand part of the image shows a density of interstitial inflammation characteristic of LIP.