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.
