Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ETT is appropriately positioned approximately 4 .2 cm above the carina . There is a right IJ catheter , which likely terminates within the right atrium . There is an NG tube , which courses below the diaphragm , however the tip is not visualized on this image . There is complete silhouetting of the left hemidiaphragm , likely representing left lower lobe collapse , however superimposed pneumonia can not be excluded . The cardiomediastinal silhouette is enlarged , which may be projectional . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
1 . Right IJ catheter terminating in the right atrium . 2 . Appropriately positioned ETT and NG tube . 3 . Complete left lower lobe collapse , likely due to mucous plugging .