Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrates clear lungs bilaterally . No focal consolidation concerning for pneumonia is identified . Cardiomediastinal and hilar contours are stable in appearance . No overt pulmonary edema is identified . There is no pleural effusion or pneumothorax . Note is made of a left brachiocephalic stent in unchanged position . No free air is seen under bilateral diaphragms .
    OUTPUT:
    
No acute intrathoracic abnormality .