Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . There are streaky left mid lung opacities , which have shifted configuration slightly ; these suggest minor chronic atelectasis or scarring . There is mild upper zone redistribution of the pulmonary vascularity which suggests pulmonary venous hypertension or perhaps slight congestion , but otherwise the lungs appear clear .
    OUTPUT:
    
Findings suggesting slight vascular congestion ; otherwise , unremarkable .