Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post mitral valve replacement . A left - sided dual - chamber pacemaker is noted with leads terminating in the right atrium and right ventricle . Moderate cardiomegaly is noted . The aorta is unfolded . There is no overt pulmonary edema , though there is mild prominence of the pulmonary vascular markings with slight cephalization . Linear opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormality is seen .
    OUTPUT:
    
Mild bibasilar atelectasis . Mild pulmonary vascular congestion without overt pulmonary edema .