Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No tracheostomy tube is seen . Dextroscoliosis of the mid thoracic spine slightly limits evaluation of the cardiac silhouette . The cardiomediastinal contours appear within normal limits . There is no pulmonary vascular congestion or edema . A left PICC is unchanged with the tip terminating in the low SVC . The lungs are slightly hyperinflated with persistent but improved severe left lower lobe atelectasis . No large pleural effusion or pneumothorax is appreciated .
    OUTPUT:
    
Slightly improved but persistent severe left lower lobe atelectasis .