Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment is limited due to positioning . Allowing for this limitation , there are coarse interstitial markings and upper vascular redistribution similar to prior exam but no focal opacity . Moderate cardiomegaly is redemonstrated . Tracheal deviation is likely due to a prominent aortic knob . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Moderate cardiomegaly and mild interstitial edema unchanged from prior radiograph . No evidence of pneumonia .