Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post posterior spinal fusion of the upper thoracic spine with an interbody spacer . There is a right - sided PICC line which terminates in the mid right atrium . The lungs are well inflated . Linear opacities at the left lung base and along the posterior aspect of the lungs on the lateral view are slightly worse compared to the prior radiograph from ___ , but have a waxing and waning appearance over other prior imaging studies . This could represent fluctuating atelectasis . There is no strong evidence for pneumonia . Osseous structures are intact . Heart size and mediastinal contours are normal .
    OUTPUT:
    
1 . Right - sided PICC line terminates in the mid right atrium . 2 . Fluctuating opacities at the left lung base may represent atelectasis or a component of organizing pneumonia as was suggested on a prior CT . 3 . No strong evidence for pneumonia .