Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle airspace opacity is noted at the medial right lung base adjacent to the right heart border , and may represent early / developing pneumonia . There is no pleural effusion , pneumothorax or pulmonary edema . The cardiomediastinal silhouette is unremarkable in appearance .
    OUTPUT:
    
Subtle airspace opacity within the right lower lobe , which may reflect early pneumonia .