Fleischner / ATS 2018 UIP CT Pattern

Fleischner Society 2018 / ATS-ERS-JRS-ALAT 2018

Classifies HRCT of fibrosing ILD into Typical UIP, Probable UIP, Indeterminate for UIP, or Most consistent with non-IPF diagnosis using the 2018 four-tier criteria shared by the Fleischner Society white paper and ATS/ERS/JRS/ALAT guideline.

Also searched as: ipf · ild · hrct · fibrosis · honeycombing · pulmonary fibrosis · lung

HRCT features present

Select all applicable defining features. Classification follows the 2018 four-tier table (presence of any alternative-diagnosis feature overrides UIP/probable patterns).

Information

Incomplete input

Please provide: at least one HRCT feature (or explicitly note absence of fibrosis).

How this tool works

In 2018 the Fleischner Society and the ATS/ERS/JRS/ALAT IPF guideline aligned on four HRCT diagnostic categories for suspected idiopathic pulmonary fibrosis. Typical UIP (honeycombing in a subpleural basal distribution without alternative-diagnosis features) can support a clinical diagnosis of IPF without surgical biopsy when the clinical context is appropriate. Probable UIP shows the same distribution with reticulation and traction bronchiectasis but without honeycombing. Indeterminate for UIP covers fibrotic change that meets neither of those patterns and does not suggest another disease. Features pointing to an alternative process (upper- or mid-lung predominance, peribronchovascular distribution, extensive GGO, marked mosaic attenuation/air trapping, profuse micronodules, discrete cysts, consolidation, or pleural plaques) place the study in the non-IPF tier. Multidisciplinary discussion remains essential for final diagnosis.

References

Implemented from the cited published sources. Educational use only; confirm against current guidelines before clinical use.

Clinical questions that use this

Vetting guides that reach for this tool.

Suspected interstitial lung disease

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