Updated ERS-ATS Classification of Interstitial Pneumonias: Key Radiologic Changes

The 2025 European Respiratory Society-American Thoracic Society (ERS-ATS) update introduces bronchiolocentric interstitial pneumonia as a new pattern, replaces desquamative interstitial pneumonia with alveolar macrophage pneumonia, and adds diagnostic confidence levels to guide…

• The classification now defines three major interstitial patterns: usual interstitial pneumonia (UIP), nonspecific interstitial pneumonia (NSIP), and the newly introduced bronchiolocentric interstitial pneumonia.
• Desquamative interstitial pneumonia is renamed alveolar macrophage pneumonia to better reflect the underlying pathology.
• Diagnostic confidence levels are formally incorporated to encourage explicit reporting of uncertainty.

Automated summary

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