Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung base opacity has improved compared to ___ . Same differential still applies ; this could be re-expansion edema , pneumonia , or pulmonary hemorrhage . There is small left subpulmonic pleural effusion . Cardiomediastinal silhouette is within normal size and unchanged .
    OUTPUT:
    
The right lung base opacity has improved compared to ___