Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with the heart size appearing mildly enlarged . There is no pulmonary edema . Left lower lateral pleural thickening appears relatively unchanged . Hazy opacification within the left lung base could reflect atelectasis though infection can not be excluded . Right lung is grossly clear . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacification may reflect atelectasis though infection can not be excluded . Unchanged degree of left inferior lateral pleural thickening .