Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view portable chest x-ray shows persistent low lung volume with new left base opacity , compatible with aspiration . Right lung is still clear . There is no pleural effusion or pneumothorax . Heart size is normal . Left PICC and transhepatic biliary pigtail are unchanged .
    OUTPUT:
    
New left base opacity compatible with aspiration .