Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly to moderately enlarged but unchanged . The aortic knob is calcified . There is mild pulmonary vascular congestion , slightly improved compared to the prior exam . Small bilateral pleural effusions persist , but are decreased compared to the prior exam . There is no pneumothorax or focal consolidation . Mild degenerative changes are noted in the thoracic spine . Widening of the left acromioclavicular joint is unchanged and likely reflects chronic injury .
    OUTPUT:
    
Mild pulmonary vascular congestion , improved compared prior study with persistent but decreased small bilateral pleural effusions .