Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is top normal in size . There pulmonary vasculature are stable and shows no significant abnormalities . Calcifications along the aortic arch are unchanged . The lungs are clear aside from bibasilar atelectasis . There is no pleural effusion or pneumothorax . There may be left thyroid lobe enlargement , given mild mass effect on the trachea .
    OUTPUT:
    
1 . No acute intrathoracic abnormality . 2 . Possible left thyroid lobe enlargement . Further evaluation by physical examination or with ultrasound can be considered if clinically warranted .