Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart remains moderately enlarged . Dense mitral annular calcifications are re- demonstrated , and there is unchanged enlargement of the main pulmonary artery . Mild pulmonary vascular engorgement appears slightly improved compared to the prior study . Aeration of the lung bases is also improved . No large pleural effusion or pneumothorax is identified , though there is trace blunting of the right costophrenic angle laterally . No pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild pulmonary vascular engorgement , slightly improved when compared to the prior exam . Improved aeration of the lung bases with resolution of the previously noted bibasilar airspace opacities .