Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal contour is unremarkable . Patchy opacities are noted in the lung bases , findings which could reflect aspiration or infection . There may be a trace left pleural effusion . No pulmonary edema or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacities in the lung bases concerning for aspiration or infection .