Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mildly enlarged and the cardiac silhouette . A prosthetic aortic valve is noted . The median sternotomy wires appear intact . No focal consolidation , pleural effusion or pneumothorax . Fusion hardware is partially imaged in the lower cervical spine .
    OUTPUT:
    
Mild cardiomegaly . No acute process