Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits , stable relative to prior examination dated ___ . There is no pleural effusion , evidence of pulmonary edema , or pneumothorax . There is no air under the right hemidiaphragm .
    OUTPUT:
    
No evidence of pneumonia .