Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes result in crowding of bronchovascular structures and slight accentuation of the cardiac silhouette compared to the baseline study of ___ . With this factor in mind , heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .