Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . The elevation of the left hemidiaphragm is unchanged . Cardiomediastinal silhouette is unremarkable . Lungs are clear . There is no pleural effusion or pneumothorax . Contour abnormality along the anterior chest wall relates to left mastectomy .
    OUTPUT:
    
No pleural effusion . Clear lungs .