Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is subsegmental linear atelectasis in the left lower lobe . No definite consolidation effusion or pneumothorax is seen . The heart and mediastinal contours appear normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm . Mild degenerative changes in the mid T - spine .
    OUTPUT:
    
No definite signs of pneumonia . Left lower lobe linear atelectasis .