Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP view of the chest is compared to previous exam from ___ . The lungs are clear . Costophrenic angles are sharp . Retrocardiac density projecting also to the right is compatible with previously seen hiatal hernia . Cardiac silhouette is within normal limits . Atherosclerotic calcifications noted at the aortic arch . Osseous and soft tissue structures are unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .