Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild opacities at the left lower lung base are likely atelectasis . No substantial pleural effusion . No pneumothorax . No focal consolidations or opacities concerning for an infectious process . Cardiomediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
No overt evidence of pneumonia . Probable left basilar atelectasis .