Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Bibasilar opacities could be due to atelectasis and / or pneumonia . No large pleural effusion is seen although a trace pleural effusion is difficult to exclude . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable . No pulmonary edema is seen .
    OUTPUT:
    
Low lung volumes . Bibasilar opacities may be due to atelectasis and / or pneumonia . No overt pulmonary edema .