Table 1 IIPs classification and their HRCT features
From: Clinical and radiological features of idiopathic interstitial pneumonias (IIPs): a pictorial review
IIPs | HRCT features | ||
|---|---|---|---|
Major | Chronic fibrosing IIPs | UIP | -Reticular pattern, with or without transaction bronchiectasis |
-Honeycombing apperance | |||
-Basal and subpleural predominance | |||
-In “UIP pattern” absence of features listed as inconsistent with UIP | |||
NSIP | -Bilateral ground-glass areas | ||
-Reticular opacities | |||
Smoking-related IIPs | RB-ILD | -Poorly defined centrilobular nodules | |
-Centrilobular emphysema and/or bronchial wall thickening | |||
DIP | -Diffuse ground-glass opacities | ||
-Irregular linear opacities | |||
-Microcyst | |||
Accute/subacute IIPs | COP | Peripheral or peribronchial patchy consolidations | |
-Ground-glass opacities with a tendency to migration | |||
Rarely mass or nodules that may cavitate (“atoll sign”) | |||
AIP | -Ground-glass attenuation areas with a mosaic pattern | ||
-Air space consolidation in dependent area | |||
Rare | LIP | -Perivascular cysts and ground-glass opacities | |
-Centrilobular and subpleuralnodules | |||
PPFE | -Subpleural thickening of apital regions | ||
-Small subpleural consolidations | |||