Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pacemaker overlying the left chest with leads in the expected position of the right atrium and right ventricle , unchanged from prior exam . The lungs are clear bilaterally with no focal consolidation , effusion or pneumothorax . The cardiomediastinal silhouette is unchanged from prior exam . Bony structures appear intact .
    OUTPUT:
    
No acute intrathoracic process .