Table 2 Etiology in UIP pattern
From: Fibrosing pneumonia – how to diagnose, and how to recognize the etiology?
| Myofibroblastic foci, cystic remodeling, timely heterogeneity | LIP pattern ± hyperplasia of BALT | Organizing pneumonia pattern | DAD pattern | Granulomas or giant cells | Lymphocytes, subtypes? | |
|---|---|---|---|---|---|---|
| IPF | present | no | no | ± in exacerbation | no | No |
| Chronic autoimmune disease | present | Yes/no | Yes/no | no | Yes/no | Mixed CD4/8 and CD20 population |
| Chronic hypersensitivity pneumonia | present | Yes/no peribronchial lymphocyte aggregates | yes | no | yes | Predominant CD8 population |