Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well - expanded lungs . There is bibasilar atelectasis , left greater than right . Chronic blunting of the posterior costophrenic angles reflects pleural thickening and Bochdalek hernia . The cardiomediastinal and hilar contours are unchanged . The descending thoracic aorta is very tortuous . There is no pneumothorax . There are healed fractures of the posterior right ___ and 9th ribs .
    OUTPUT:
    
No evidence of pneumothorax or widened mediastinum .