Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . There is opacity in the right lung base medially with obscuration of the right heart border , concerning for pneumonia or aspiration . No other focal opacities . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is moderately enlarged , similar to prior exam .
    OUTPUT:
    
Opacity in the medial right lung base with obscuration of the right heart border , concerning for pneumonia or aspiration .