Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes result in accentuation of the cardiac silhouette size which appears mildly enlarged . The aorta is tortuous . Hilar contours are unremarkable , and there is no pulmonary edema . Streaky and linear bibasilar opacities are compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . Cervical spinal fusion hardware is incompletely assessed . There are mild multilevel degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Mild cardiomegaly .