Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is subtle left basilar opacity seen on the frontal view , not confirmed on the lateral . Elsewhere , lungs are clear . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Subtle left basilar opacity seen on the frontal view , potentially atelectasis noting infection is not entirely excluded .