Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . Lung volumes are very low with worsening perihilar and interstitial opacities consistent with pulmonary edema . There is also probably a mild pleural effusion on the left . The heart size is mildly enlarged . There is no pneumothorax .
    OUTPUT:
    
Mild interstitial pulmonary edema .