Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable chest radiograph was provided . Subtle hazy opacity at the right base which may represent atelectasis ; however , early infection can not be excluded . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . Heart size is top normal ; however , this may be due to AP projection . There are no acute skeletal abnormalities .
    OUTPUT:
    
Subtle hazy opacity right base is most likely atelectasis but can not exclude early infectious process .