Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ill - defined airspace opacity in the right lower lobe medially appears slightly more apparent since ___ , this could represent worsening airspace opacity . The left lung is relatively clear . No significant effusions or pneumothorax . The heart size is stable and the left lung is clear
    OUTPUT:
    
Ill - defined opacity in the right lower lobe can reflect atelectasis or pneumonia in the appropriate clinical setting .