Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . Within the limitations of technique , the cardiac , mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear . The patient is status post posterior the thoracolumbar fusion . Fracture and displacement of pedicle screws is noted at the uppermost level with increased degree of retraction since the prior study .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary disease . 2 . Some interval retraction of pedicle screws at the uppermost level of prior posterior thoracolumbar fusion , although already fractured previously .