Table 1 Criteria of UIP pattern
From: Fibrosing pneumonia – how to diagnose, and how to recognize the etiology?
| Definite UIP | Probable UIP, at least two features should be present | Definite not UIP | |
|---|---|---|---|
| Myofibroblastic foci scarce or abundant | yes | yes | Yes/no |
| Cystic remodeling with bronchiolar metaplasia | yes | Yes/no | no |
| Timely heterogeneity, i.e. normal alveolar septa | yes | Yes/no | No |
| Geographic heterogeneity, i.e. peripheral predominance | yes | Yes/no | No |
| Fibrosis, scar | yes | no | Yes/no |