Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Tip of left PICC now terminates in the axilla . Deviation of the trachea to the right raises possibility of a thyroid mass . Lung volumes are significantly reduced but unchanged compared to prior . Enlarged cardiac silhouette is in part due to a combination of low lung volumes and technique . Opacification seen at the right base is likely caused by a combination of low lung volumes , atelectasis , and possibly a small pleural effusion , superimposed pneumonia is not excluded . Free air under the diaphragm is again noted in this postoperative patient .
    OUTPUT:
    
1 . No significant changes compared to the prior study . Basilar opacification likely represents atelectasis , but in the appropriate clinical context pneumonia is also possible . 2 . Deviation of the trachea to the right raises the possibility of a thyroid mass . 3 . Left PICC has been withdrawn and tip now ends in the axilla .