Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is bibasilar atelectasis . Blunting of posterior costophrenic angles may be due to atelectasis , although a trace pleural effusion can not be excluded . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Bibasilar atelectasis . Trace blunting of bilateral posterior costophrenic angles could be due to atelectasis or pleural thickening , although trace effusions can not be excluded .