Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal chest radiograph shows no free air under the diaphragm . There is no pleural effusion or pneumothorax . There is no focal airspace consolidation . The cardiac and mediastinal contours are normal . There is mild vascular congestion without overt pulmonary edema .
    OUTPUT:
    
No free air under the diaphragm .