Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates normal heart size . The thoracic aorta is mildly unfolded with arch calcifications . Mild prominence of the upper mediastinum is felt to be related to supine positioning and AP projection , less likely vascular injury . The azygos contour is full . The lungs are clear without evidence of edema , pneumothorax , or pleural effusion .
    OUTPUT:
    
1 . No definite acute cardiopulmonary process . 2 . Azygos fullness could be related to hydration versus a component of right heart insufficiency . 3 . This exam is not designed for assessment of rib fractures ; however , no displaced osseous injury is detected .