Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . The left hemidiaphragm is elevated and there is subtle opacity at the left base which most likely represents atelectasis . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Elevation of left hemidiaphragm and left basilar opacities which likely represent atelectasis .