Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP chest radiograph was obtained . Septal lines in the interstitial markings are more prominent compared with ___ . The hila are indistinct . Minimal atelectasis is seen at the left base . There is no focal consolidation , effusion or pneumothorax . Severe cardiomegaly is unchanged .
    OUTPUT:
    
Mild interstitial edema .