Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate clear lungs bilaterally . Lungs are well expanded symmetrically . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema . Irregularity involving the lateral right seventh rib appears to have been present since ___ , potentially sequela of prior trauma .
    OUTPUT:
    
No opacity convincing for pneumonia .