Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No comparison studies . Please note that comparison to old studies can be helpful to detect subtle interval change . PA and lateral chest radiograph demonstrates clear lungs bilaterally . No focal opacity convincing for pneumonia is identified . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema .
    OUTPUT:
    
No opacity convincing for pneumonia .