Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer is re - demonstrated with lead terminating in the right ventricle . Mild cardiomegaly is again noted , and likely accentuated by and the presence of low lung volumes . A moderate size hiatal hernia is also present . The mediastinal and hilar contours are otherwise unchanged . Pulmonary vasculature is not engorged . There is streaky atelectasis in the retrocardiac region without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Moderate size hiatal hernia .