Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is top - normal in size . Midline sternal wires are well aligned and intact . The mediastinal contours are unchanged since the prior examination . There is mild central vascular prominence without interstitial edema . No definite focal consolidation is identified . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No definite acute intrathoracic abnormality .