Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pectoral pacer leads terminate in the right atrium and right ventricle , as expected . Lungs are clear of consolidation , effusion or pneumothorax . No pulmonary edema . Mild cardiomegaly is unchanged . Mediastinal contours are normal .
    OUTPUT:
    
No evidence of acute intrathoracic process .