Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Support devices remain in good position . Increasing asymmetric opacities , in the left upper lobe can be infection or asymmetric edema . Slight improved aeration of the left lower lobe . Mild right - sided basilar opacities are likely atelectasis . Cardiomediastinal silhouette is stable . No substantial pneumothorax or pleural effusion .
    OUTPUT:
    
Asymmetric left upper lobe opacities , concerning for pneumonia in the appropriate clinical setting .