Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is stable and within normal limits . The hila are unremarkable . Re-identified is the airspace opacity within right lower lobe which is persistent however improved in comparison to the prior study . There is no new focal lung consolidation elsewhere . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Persistent but mildly improving right lower lobe pneumonia .