Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . There is mild obscuration of the right cardiac border , however , no definite densities are appreciated on the lateral view . A small left pleural effusion is present . There is no pneumothorax . No bony abnormalities are seen .
    OUTPUT:
    
1 . Small left pleural effusion . 2 . Mild obscuration of the right cardiac border , likely secondary to atelectasis .