Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate clear lungs bilaterally . No focal opacity convincing for pneumonia . Heart size is normal . Hilar and mediastinal contours are within normal limits . There is no pneumothorax or pleural effusion . Osseous structures are without acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .