Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are remarkable for a tortuous thoracic aorta . Lungs are clear except for linear bibasilar opacities . Small pleural effusions are present bilaterally . Multilevel degenerative changes are present in the spine . There are no acute osseous abnormalities .
    OUTPUT:
    
Linear bibasilar atelectasis and small pleural effusions .