Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Central pulmonary vascular engorgement and mild pulmonary edema appears increased slightly since ___ examination , particularly along the lower zones . There is no pneumothorax or pleural effusion . The heart size is unchanged . The hilar and mediastinal contours remain stable . Severe emphysema is again seen .
    OUTPUT:
    
Slightly worsened central pulmonary vascular congestion and mild edema since ___ .