Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of a left subclavian CVL with tip in the mid SVC . The lungs are mildly hypoinflated with crowding of vasculature . No focal opacity . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable .
    OUTPUT:
    
Left subclavian CVL with tip in mid SVC . No pneumothorax .