Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and a lateral chest radiograph demonstrates well expanded and clear lungs bilaterally . No focal opacities identified . Mediastinal and hilar contours are within normal limits . Osseous structures are without acute abnormality . No evidence of pneumothorax or pleural effusion .
    OUTPUT:
    
No acute intrathoracic abnormality .