Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Probable mild cardiomegaly , though the cardiomediastinal silhouette is unchanged . Again seen is upper zone redistribution , unchanged , without overt CHF . Minimal bibasilar atelectasis and / or scarring is unchanged . No focal infiltrate , consolidation , effusion or pneumothorax is detected . Incidental note is made of right upper quadrant cholecystectomy clips and aortic calcification , better depicted on an abdominal CT from ___ .
    OUTPUT:
    
Mild cardiomegaly and upper zone redistribution , unchanged . Minimal bibasilar atelectasis and / or scarring unchanged . Allowing for this , no acute pulmonary process identified . No pneumonic infiltrate or pleural effusion detected .