Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left - sided pacemaker device with single lead terminating in the right ventricle . Heart size remains moderate to severely enlarged . Aortic knob is calcified . Mild interstitial pulmonary edema is present . Small right pleural effusion is increased compared to the prior exam with worsening patchy opacity in the right lung base . No left - sided pleural effusion is demonstrated . No pneumothorax is identified .
    OUTPUT:
    
Mild congestive heart failure . Small right pleural effusion , increased compared to the previous exam . Patchy opacity in the right lung base may reflect atelectasis but infection is not excluded .