Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest demonstrates no focal consolidations . The heart size is normal . The mediastinal contours are unremarkable . No pleural effusion , edema or pneumothorax . Previous right basilar opacities continue to exist as do left basilar opacities suggesting that this may be atelectasis .
    OUTPUT:
    
Bilateral basilar opacities , most likely atelectasis .