Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ET tube is present , tip approximately 4 .9 cm above the carina . There are low inspiratory volumes . There is increased retrocardiac density , consistent with left lower lobe collapse and / or consolidation , and minimal atelectasis at the right lung base . No pneumothorax , overt CHF , or gross effusion identified . A spring overlying the left upper zone is thought to lie outside the the patient . There is a small slightly curvilinear density , likely metallic , measuring approximately 3 .6 mm , which overlies the left mid chest slightly lateral to the heart border . In addition , it overlies the left first anterior rib . This likely corresponds the small density identified on the MR pre screening study . The the patient position is change between the 2 studies , more LPO on the prior study and very slightly RPO on the current study . The small metallic density overlay the heart on the prior study and now overlies the lung , separate from the heart .
    OUTPUT:
    
1 . ET tube in place , 4 .9 cm above the carina . 2 . Left lower lobe collapse and / or consolidation , similar to the prior study . 3 . Tiny metallic density is again seen , suggesting it lies within the the patient . It shows change in position with change in the patient position , but its location is not fully characterized on the basis of this . It is new compared with ___ .