Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . The patient is status post median sternotomy and cardiac valve replacement . There is mild bibasilar atelectasis . No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Degenerative changes are seen along the spine . The aorta is calcified .
    OUTPUT:
    
Mild bibasilar atelectasis . Otherwise , no acute cardiopulmonary process .