Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Given for differences in technique , the overall appearance of the lungs are unchanged since ___ . No acute focal pneumonia , moderate cardiomegaly chronic central vascular enlargement can be pulmonary venous or arterial enlargement . No pleural effusions . No significant interstitial edema .
    OUTPUT:
    
Chronic moderate cardiomegaly and chronic central vascular enlargement , can be pulmonary venous or arterial enlargement . No acute pulmonary edema .