Introduction. The new 2018 international guidelines for diagnosing usual interstitial pneumonia (UIP)/idiopathic pulmonary fibrosis (IPF) by CT scan split the old pattern possible UIP (2011 IPF guidelines) into two new patterns: probable UIP and indeterminate for UIP.However, the proportions and prognoses of these new CT-scan patterns are not clear.J o u r n a l P r e -p r o o f 2 Methods. We used a monocentric retrospective cohort of 322 patients suspected of having IPF

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