Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs the chest demonstrate well - expanded lungs . There is increased opacification of the bilateral bases , which likely represents atelectasis . Moderate cardiomegaly is unchanged . Median sternotomy wires are in place . The patient is status post aortic valve replacement . There is no pneumothorax , pleural effusion or focal consolidation .
    OUTPUT:
    
No acute cardiopulmonary process .