Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Fine detail is limited by the overlying soft tissues . The cardiac silhouette is unchanged and normal . Mediastinal contours are unremarkable . There is no pleural effusion , pneumothorax or airspace consolidation . The lung volumes are slightly lower than prior , resulting in crowding of the bronchovascular structures .
    OUTPUT:
    
Normal heart size .