Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal , and hilar contours are unremarkable . Lungs are clear without focal consolidation , pneumothorax , or pleural effusion . Streaky opacities in the bilateral lung bases are due to atelectasis . Rounded opacity in the posterior left lung base corresponds to a fat containing Bochdalek 's hernia , seen on the prior radiograph .
    OUTPUT:
    
No focal consolidation or pneumothorax .