Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP upright view of the chest was obtained . Allowing for differences in technique and positioning , moderate cardiomegaly is probably unchanged . A single - lead pacemaker is again noted . The cardiomediastinal silhouette is stable . Lungs are clear . There is no pleural effusion or pneumothorax . There is no pulmonary edema .
    OUTPUT:
    
Moderate cardiomegaly . No acute intrathoracic abnormality .