Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left - sided pacemaker with leads ending in the right atrium and right ventricle . The lungs are clear without focal consolidation , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal . There are degenerative changes in the the thoracic spine .
    OUTPUT:
    
No acute intrathoracic process .