Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Heart size is normal . Cardiomediastinal contours are stable with tortuosity of the thoracic aorta . Bibasilar linear opacities are consistent with atelectasis . No focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Bibasilar atelectasis without definite focal consolidation .