Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest demonstrates low lung volumes . The study is somewhat limited due to patient 's body habitus . Hilar and mediastinal silhouettes are unchanged . Intrathoracic aorta is tortuous . Heart is mildly enlarged , unchanged . Linear opacity in the left lung base is longstanding and likely represents an area of scarring . There is mild pulmonary edema . Bibasilar opacities are noted , which may reflect atelectasis . A fixation hardware overlying of the right humerus is noted .
    OUTPUT:
    
Mild cardiomegaly and pulmonary edema . Bibasilar opacities , likely atelectasis or infection in the appropriate clinical setting .