Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral radiographs demonstrate clear lungs with no pleural effusion or pneumothorax evident . Heart size is mildly enlarged with an unfolded aorta . Fullness in the right upper mediastinal region likely represents mediastinal vessels . Right paratracheal stripe is maintained .
    OUTPUT:
    
Mildly enlarged cardiac silhouette . No evidence of pneumonia or pleural effusions .