Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi upright AP image of the chest . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unchanged from prior exam with prominence of the right pulmonary artery again noted . The apparent enlargement of the aorta is due to adjacent atelectasis , as seen on recent CT .
    OUTPUT:
    
No acute cardiopulmonary process .