Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Support Devices : None . The lungs are clear . The hilar and cardiomediastinal contours are normal . There has been interval normalization of the heart size . Particularly , the left heart border was previously convex and now has regained its normal straight to concave morphology . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Short interval normalization of heart size raises question of either resolved pericardial effusion or resolved hypervolemia .