ATS GUIDELINES Bundle

INSIDE ▶ Introduction ▶ Recommendations ▶ Tables ▶ Figures Idiopathic Pulmonary Fibrosis and Progressive Pulmonary Fibrosis

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4 Tables Table 1. High-resolution Computed Tomography (HRCT) Patterns in IPF HRCT Pattern UIP pattern Probable UIP pattern Level of confidence for UIP histolog y Confident (>90%) Provisional high confidence (70–89%) Distribution • Subpleural and basal predominant • Often heterogeneous (areas of normal lung interspersed with fibrosis) • Occasionally diffuse • May be asymmetric • Subpleural and basal predominant • Often heterogeneous (areas of normal lung interspersed with reticulation and traction bronchiectasis/ bronchiolectasis) Computed tomography (CT) features • Honeycombing with or without traction bronchiectasis/ bronchiolectasis • Presence of irregular thickening of interlobular septa • Usually superimposed with a reticular pattern, mild GGO • May have pulmonary ossification • Reticular pattern with traction bronchiectasis/ bronchiolectasis • May have mild GGO • Absence of subpleural sparing e previous term, "Early UIP pattern", has been eliminated to avoid confusion with "interstitial lung abnormalities (ILA)" described in the text. e term, "Indeterminate for UIP", has been retained for situations in which the HRCT features do not meet UIP or probable UIP criteria, and do not explicitly suggest an alternative diagnosis.

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