Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tracheostomy tube is unchanged in position . Cervical spinal fixation hardware is incompletely imaged . There is significantly improved aeration of the left lung base and definition of the left hemidiaphragm compatible with resolved left lower lobe atelectasis . There is no pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . The cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Resolved left lower lobe atelectasis .