Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tracheostomy tube is in satisfactory position with the tip approximately 4 .2 cm from the carina . A left subclavian central venous catheter is in unchanged position . A nasogastric tube courses below the diaphragm with the tip out of the field of view . Sternal wires are intact . Since the prior exam , the lung volumes are lower , which accentuates the bronchovascular structures . Moderate elevation of the left hemidiaphragm with associated atelectasis is stable . A new left perihilar and lower lung zone opacity is present . There is no overt pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . Satisfactory position of the multiple support devices . 2 . New left perihilar and lower lung zone opacity , which may represent atelectasis , though in the proper clinical setting could be due to a new pneumonia or aspiration . Results were text paged to the covering neurosurgery NP ___ at 5 :45 PM on ___ via telephone by Dr . ___ ___ minutes after the findings were discovered .