Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi upright frontal image of the chest . The right PICC terminates in the area of the right brachiocephalic venous confluence , unchanged from prior exam . The ET tube is in adequate position . The NG tube is folded in the stomach . There are low lung volumes . Opacity at the left lung base likely represents atelectasis . Mild pulmonary edema has improved from prior exam . Cardiomediastinal silhouette is enlarged , unchanged from prior exam . There is a residual left pleural effusion . There is no right pleural effusion . No pneumothorax is seen .
    OUTPUT:
    
1 . Right PICC terminates in the area of the brachiocephalic venous confluence , unchanged from prior exam . 2 . Mild pulmonary edema and left pleural effusion have improved from prior exam . 3 . Left lung base opacity , which may represent atelectasis . 4 . Cardiomegaly . Findings were communicated to Dr . ___ at 11 :15 p .m . on ___ by phone .