Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube is similarly positioned with tip projecting approximately 4 cm above the carina . Elevation of the right hemidiaphragm persists with platelike atelectasis in the right upper lung . There is improved aeration of the left lung . No pleural effusion or pneumothorax is detected . Right PICC courses to the low superior vena cava .
    OUTPUT:
    
Improved aeration of the left lung .