Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is moderately enlarged with tortuosity of the thoracic aorta unchanged from prior study . Hilar contours are unremarkable . Lungs are clear . There is no evidence of pulmonary vascular congestion , interstitial edema or fibrotic change . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Moderate cardiac enlargement without evidence of fluid overload . No acute intrathoracic abnormality .