Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with single lead terminating in the right ventricle . There is mild to moderate cardiomegaly , unchanged . The aorta is mildly tortuous . Mediastinal contour is otherwise stable . There is mild pulmonary vascular congestion . No focal consolidation or pneumothorax is seen . Patchy opacity within the lower lobes may reflect atelectasis . There appears to be trace bilateral pleural effusions posteriorly on the lateral view . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild pulmonary vascular congestion and trace bilateral pleural effusions . Probable mild bibasilar atelectasis .