Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is unfolded . Minimal atherosclerotic calcifications are noted at the aortic knob . Mediastinal and hilar contours are unchanged and within normal limits . Streaky linear opacity in the left lower lobe likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . The pulmonary vasculature is normal . Moderate multilevel degenerative changes are seen in the imaged thoracolumbar spine with partially imaged fusion hardware at the thoracolumbar junction .
    OUTPUT:
    
Left lower lobe atelectasis . Otherwise , no acute cardiopulmonary abnormality .