Table 1. High-resolution computed tomography criteria for usual interstitial pneumonia (UIP) pattern.

UIP pattern (all four features)	Possible UIP pattern (all three features)	Inconsistent with UIP pattern (any of the features)
Subpleural, basal predominance	Subpleural, basal predominance	Upper or mid-lung predominance
Reticular abnormality	Reticular abnormality	Peribronchovascular predominance
Honeycombing with or without traction bronchiectasis	Absence of features listed as inconsistent with UIP pattern	Extensive ground-glass abnormality (extent > reticular abnormality)
Absence of features listed as inconsistent with UIP pattern		Profuse micronodules (bilateral, predominantly upper lobes)
		Discrete cysts (multiple, bilateral, away from areas of honeycombing)
		Diffuse mosaic attenuation/air-trapping (bilateral and in ≥3 lobes)
		Consolidation in bronchopulmonary segment(s)/lobe(s)

Reproduced from [1] with permission from the publisher.