Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph was obtained with the patient in upright position . Compared to prior study , there has been no significant interval change . There is persistent pulmonary vascular congestion and mild interstitial edema . No focal consolidation , pleural effusion , or pneumothorax is seen . The heart size is top normal . Mediastinal and hilar contours are stable .
    OUTPUT:
    
Persistent stable vascular congestion and mild interstitial edema .