Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi upright view of the chest . Overlying EKG leads are present . Linear densities in the lower lungs most compatible with atelectasis . No large effusion or pneumothorax . No convincing evidence for pneumonia . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact .
    OUTPUT:
    
Mild bibasilar atelectasis . Otherwise unremarkable . Please refer to subsequent CT for further details .