Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , resulting in vascular crowding . The lungs are clear , there is no focal consolidation to suggest pneumonia . There is no pleural effusion or pneumothorax . Patchy opacities at the left base likely represent atelectasis . The heart size is normal . Calcifications are again seen within the aortic arch and a left - side pacemaker with wires terminating in the right atrium and right ventricle are noted .
    OUTPUT:
    
No evidence of acute intrathoracic process .