Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left subclavian central venous catheter terminates in the upper SVC . No pneumothorax is present . Tracheostomy tube is in unchanged position . Cardiac and mediastinal contours are grossly unchanged allowing for differences in technique and patient rotation . Re - demonstrated is a layering left pleural effusion with left basilar opacity , possibly atelectasis . Right lung remains clear . No pulmonary edema is identified . Vascular calcifications are noted projecting over the left apex .
    OUTPUT:
    
Left subclavian central venous catheter tip in the upper SVC . No pneumothorax .