Idiopathic interstitial pneumonias

High-resolution computed tomography features

UIP

Reticular pattern with presence or absence of transaction bronchiectasis, honeycombing appearance, basal and subpleural predomination, in UIP pattern deficits of features listed as inconsistent with UIP.

NSIP

Bilateral ground glass regions, reticular opacities.

RB-ILD

Badly defined centrilobular nodules, bronchial wall thickening or centrilobular emphysema.

DIP

Diffuse ground glass opacities, irregular linear opacities, Microcysts.

COP

Distinctive peripheral or peribronchial patchy consolidations, Ground-glass opacities with migrating tendency, rarely a mass or nodule that may cavitate the typical appearance of an “atoll sign”.

AIP

Ground glass attenuation regions with mosaic pattern, independent area with air space consolidation.

LIP

Perivascular cysts and ground glass opacities, centrilobular and subpleural nodules.

PPFE

Apical regions with subpleural thickening, small subpleural consolidations.