Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study limited by poor penetration . Mild enlargement of cardiac silhouette . There are subtle linear opacities in the right middle lobe , likely representing atelectasis . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .