Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged and the aorta is tortuous . The hilar contours are within normal limits . There is mild vascular congestion without frank pulmonary edema . Subtle retrocardiac opacity likely represents dilated pulmonary veins . No evidence of pleural effusion or pneumothorax .
    OUTPUT:
    
Marked cardiomegaly and mild vascular congestion without frank edema .