Fig. 2From: Early prolonged prone position in noninvasively ventilated patients with SARS-CoV-2-related moderate-to-severe hypoxemic respiratory failure: clinical outcomes and mechanisms for treatment response in the PRO-NIV studyExtent and nature of lung parenchymal involvement at three levels (upper, middle, lower) were quantified according to the score validated by Salaffi et al. (score range 0–96). Two cases with pre/post-treatment CT scans are provided belowBack to article page