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

UIP pattern^#	Possible UIP pattern^¶	Inconsistent with UIP pattern⁺
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 (see third column)	Extensive ground-glass abnormality (extent more than reticular abnormality)?
Absence of features listed as inconsistent with UIP pattern (see third column)		Profuse micronodules (bilateral, predominantly upper lobes)
		Discrete cysts (multiple, bilateral, away from areas of honeycombing)?
		Diffuse mosaic attenuation/air-trapping (bilateral, in three or more lobes)
		Consolidation in bronchopulmonary segment(s)/lobe(s)

^#: all four features; ^¶: all three features; ⁺: any of the seven features. Reproduced from [2] with permission from the publisher.