Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Of note , the evaluation of the upper mediastinum is limited by external artifact .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . If there are concerns about upper mediastinal pathologies such as thyromegaly , a new frontal view might be pursued for further assessment .