Diagnostic HRCT criteria for usual interstitial pneumonia (UIP) pattern - ATS/ERS/JRS/ALAT (2018)
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Specific diagnostic HRCT criteria for usual interstitial pneumonia (UIP) pattern have been proposed by international consensus of ATS/ERS/JRS/ALAT 1,2.
Classification
UIP pattern
All four features present:
- subpleural, basal predominance
- reticular abnormality
- honeycombing +/- traction bronchiectasis
- absence of features listed as "inconsistent with UIP" (see below)
Possible UIP pattern
All three features present:
- subpleural, basal predominance
- reticular abnormality
- absence of features listed as "inconsistent with UIP" (see below)
Inconsistent with UIP pattern
Any one of the following seven features present:
- upper or mid-lung predominance
- peribronchovascular predominance
- extensive ground glass abnormality (i.e. more than reticular abnormality)
- profuse micronodules (bilateral, predominantly upper lobes)
- discrete cysts (multiple, bilateral, away from honeycombing)
- diffuse mosaic attenuation / air-trapping (bilateral in ≥3 lobes)
- consolidation in bronchopulmonary segment(s) or lobe(s)
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