Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New right middle lobe airspace opacity may be due to infection or aspiration . There is no pneumothorax . The left lung is clear . There is no pleural effusion . The heart and mediastinum are within normal limits .
    OUTPUT:
    
New right middle lobe airspace opacity may be due to infarct or aspiration . No pleural effusion .