Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . Lung volumes are low . Allowing for this , no definite consolidation , effusion , or pneumothorax is seen . The cardiomediastinal silhouette appears normal . No free air below the right hemidiaphragm is seen . Imaged osseous structures appear intact .
    OUTPUT:
    
No acute intrathoracic process .