Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged . A right - sided pacemaker generator pack projects a single lead into the right ventricle . Multiple sternal wires and mediastinal clips denote prior cardiac surgery . The aorta is mildly calcified and moderately tortuous . Central pulmonary vessels are engorged , but there is no overt edema . A small left pleural effusion is again seen . There is left lower lobe rounded atelectasis . A moderate hiatal hernia is present .
    OUTPUT:
    
Right - sided pacemaker projecting a lead into the right ventricle .