Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . A left sided pacemaker is seen in adequate position with its leads terminating in the right atrium and right ventricle , expected locations . There is calcification of the aortic knob . There are increased interstitial pulmonary markings which may relate to chronic lung findings or mild pulmonary edema . There is no definite focal consolidation , pleural effusion or pneumothorax .
    OUTPUT:
    
Increased interstitial pulmonary markings may relate to chronic lung findings or mild pulmonary edema .