Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Aeration at the left lung base has improved compared to the prior study from ___ . The lungs are otherwise clear . Severe enlargement of the cardiac silhouette is not significantly changed . The mediastinal contours are normal . There are no definite pleural effusions . No pneumothorax is seen . Loss of height of a mid thoracic vertebral body is unchanged .
    OUTPUT:
    
Cardiomegaly , unchanged . Improved aeration at the left lung base .