- Definitive criteria: presence of lung volume reduction, reticular abnormalities, traction bronchiectasis, or both, with a basal and peripheral predominance; the presence of honeycombing with a basal and peripheral predominance; and the absence of atypical features of usual interstitial pneumonia - micronodules, peribronchovascular nodules, consolidation, isolated (nonhoneycombing) cysts, ground-glass attenuation (or if present, less extensive than the reticular opacity), and mediastinal adenopathies (or if present, too limited to be visible on a chest radiography).