Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Due to an error in PACS , the study is being interpretted on ___ . Faint opacity in the left lower lobe is likely due to atelectasis , however , infection can not be excluded . There is no pneumothorax or pleural effusions . Sternal wires remain aligned . Cardiomediastinal silhouette is normal and there is no evidence for pulmonary vascular congestion .
    OUTPUT:
    
Left lower lobe opacity is most likely representative of atelectasis . However , pneumonia must be excluded in the proper clinical setting .