Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy catheter terminates at the level of the carina and should be re-adjusted . A large caliber central venous catheter from a right approach terminates at the cavoatrial junction . There are low lung volumes bilaterally resulting in bronchovascular crowding . An opacity within the left base may be a combination of atelectasis and effusion , though infection can not be excluded . No pneumothorax is evident . There is no interstitial pulmonary edema . Mediastinal and hilar contours are within normal limits . A rounded density in the right glenoid may be a bone island .
    OUTPUT:
    
1 . Left basilar opacity , likely a combination of pleural fluid and atelectasis , though infection remains within the differential . 2 . Low position of the tracheostomy tip at the carina . Re-adjustment recommended . The above findings and recommendations were communicated to Dr . ___ at 12 : 18 pm on ___ by telephone by Dr . ___ . The patient was already scheduled to have intraoperative replacement of the tracheostomy later in the same day .