Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild pulmonary vascular congestion without overt edema . This has not significantly changed from prior exam . There is no focal airspace opacity , pleural effusion , or pneumothorax . The mediastinal contours are normal . The heart is mildly enlarged , and also unchanged .
    OUTPUT:
    
Unchanged mild vascular congestion . No evidence of pneumonia .