Fig. 2From: Radiographic patterns and severity scoring of COVID-19 pneumonia in children: a retrospective studyDistribution of lung zones. a The peripheral, middle, and perihilar lung zones are divided into three equal zones in each lung. b The upper zone extends from the apical lung to the superior portion of the hilum. The mid-zone is the space between the superior and inferior hilar regions. The lower zone extends from the inferior hilar margin to the costophrenic angleBack to article page