Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Heart size and cardiomediastinal contours are normal . Lung volumes are slightly decreased with bibasilar patchy opacities . No pleural effusion or pneumothorax .
    OUTPUT:
    
Bibasilar patchy opacities may reflect atelectasis in the setting of low lung volumes , but infection is not excluded .