Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The lungs are clear . There is minimal left basilar atelectasis . There is no pleural effusion or pneumothorax . The left atrium remains dilated . Moderate cardiomegaly is again seen . The aortic and mitral valve replacements are unchanged in position .
    OUTPUT:
    
No acute cardiopulmonary abnormality .