Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aorta is tortuous and calcified . Patchy ill - defined opacities are noted at the lung bases , which are non-specific and could represent infection , aspiration , or atelectasis . No pleural effusion or pneumothorax is seen . Degenerative changes of both acromioclavicular joints are noted .
    OUTPUT:
    
Patchy opacities at the lung bases which are nonspecific , but may represent infection , aspiration or atelectasis .