Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded and clear . Heart size is at the upper limits of normal or minimally enlarged . The mediastinal silhouette is within normal limits . There is minimal upper zone redistribution , without overt CHF . No focal infiltrate or pleural effusion is detected .
    OUTPUT:
    
Borderline cardiomegaly . Mild upper zone redistribution , without overt CHF .