Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is of normal size with normal cardiomediastinal contours . The pulmonary vasculature is unremarkable . Linear opacity overlying the lower thoracic vertebral bodies on lateral view is most compatible with atelectasis , but pneumonia can not be excluded in the correct clinical setting . No diffuse pulmonary abnormality is present . No pleural effusion or pneumothorax . Osseous structures are unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Streaky linear opacity overlying the lower thoracic vertebral bodies , most compatible with atelectasis , although atypical pneumonia can not be excluded in the correct clinical setting .