Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is unremarkable . An opacity projecting over the lateral right mid lung is new from prior examination . Basilar predominant emphysema suggests alpha - 1 antitrypsin deficiency . Previously present left mid and lower lung opacities have partially cleared . A small left pleural effusion persists .
    OUTPUT:
    
A focal opacity in the right midlung is concerning for a new focus of pneumonia . Left mid and lower lung opacities have improved since ___ .