Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . Diffuse patchy airspace opacification noted in the right lung base , which is concerning for an acute infectious process versus aspiration . The left lung is well expanded and clear . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is seen . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Patchy opacification in the right lung base , concerning for pneumonia versus aspiration .