Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart appears enlarged , which may be exaggerated due to low lung volumes . The cardiomediastinal and hilar contours are within normal limits . Bibasilar opacities are likely related to small pleural effusions and atelectasis however , in the appropriate clinical setting , a superimposed pneumonia can not be excluded . There is no evidence of pneumothorax .
    OUTPUT:
    
Bibasilar opacities likely related to small pleural effusions and atelectasis however superimposed pneumonia can not be excluded .