Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is streaky density bilaterally most consistent with subsegmental atelectasis , as before . The heart is at the upper limit of normal in size . The aorta is mildly tortuous and calcified . Mediastinal structures are stable . The bony thorax is grossly intact .
    OUTPUT:
    
Bilateral subsegmental atelectasis .