Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright portable view of the chest is compared to previous exam from ___ . Lungs are clear . There is no effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . No free air is seen below the diaphragm .
    OUTPUT:
    
Unremarkable portable chest x-ray without visualized free air below the diaphragm .