Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is probably is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . Opacities at the left lung base are consistent with atelectasis . There is a very small pleural effusion on the left . A surgical drain projects over the left upper quadrant of the abdomen . There is no free air .
    OUTPUT:
    
Minor atelectasis and small pleural effusion on the left .