Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Compared to prior study , there is increase in interstitial opacities throughout both lungs , which is more symmetric today . This most likely represents pulmonary edema . Mild cardiomegaly is stable . Aortic knob calcifications are stable . No large pleural effusion or pneumothorax .
    OUTPUT:
    
Slight increase in bilateral interstitial opacities consistent with pulmonary edema .