Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , lung volumes are lower . There is increased opacification at the right lung base . Cardiac silhouette has increased in size , possibly secondary to lower lung volumes . Mediastinal contour is normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacification at the right lung base obscuring the right cardiac border , concerning for developing right middle lobe pneumonia .