Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable chest radiograph demonstrates unchanged mediastinal , hilar , and cardiac contours . There has been interval development of bibasilar opacities likely reflecting atelectasis , though can not exclude developing infectious process . Additionally , there has been interval increase in small right - sided pleural effusion .
    OUTPUT:
    
Bibasilar opacities , likely atelectasis . Increased small right pleural effusion .