Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable chest radiograph demonstrates clear lungs bilaterally . Cardiomediastinal and hilar contours appear within normal limits . There is no pneumothorax or large pleural effusion . No overt pulmonary edema . No air under the right hemidiaphragm is identified . Osseous structures demonstrate no acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .