Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal left lung base linear atelectasis with otherwise clear lungs . A tracheostomy tube is again noted . There is no pneumothorax or pneumomediastinum . The heart and mediastinum are within normal limits despite the projection . Generalized osteopenia and spinal degenerative changes are noted .
    OUTPUT:
    
Minimal left lung base linear atelectasis with otherwise clear lungs . No pneumomediastinum or pneumothorax .