Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest tube has been withdrawn and now projects over the sixth posterior rib at the mid clavicular level and is in correct position . ET tube is 4 cm above the level of the carina and in correct position . Right subclavian tip is in low SVC . Left subclavian arterial tip is in the aortic arch . Right pigtail appears in correct position and end of NG tube extends off film . The right lung appears unchanged . Again seen is the anterior left pneumothorax with subcutaneous emphysema . Given supine position , it is difficult to assess size . The opacity in the left mid chest is unchanged . Heart size and mediastinal contour appear normal .
    OUTPUT:
    
Unchanged left mid thorax density which may represent hematoma or in the appropriate clinical setting , pneumonia .