Table 2. Diagnosis of idiopathic pulmonary fibrosis (IPF)
HRCT featuresPathological features
Definite IPFUIPNo biopsy
Definite UIP
Probable UIP
Possible UIP
Unclassifiable fibrosis
Possible UIPDefinite UIP
Probable UIP
Probable IPFPossible UIPPossible UIP
Unclassifiable fibrosis
Possible IPFInconsistent with UIPDefinite UIP
Not IPFUIPNon-UIP
Possible UIPNon-UIP
Inconsistent with UIPProbable UIP
Possible UIP
Unclassifiable fibrosis
Not UIP

  • The high-resolution computed tomography (HRCT) criteria for usual interstitial pneumonia (UIP) are listed in table 1. A diagnosis of IPF is made when the HRCT feature is associated with one pathological feature.