Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left subclavian porta catheter continues to terminate in the mid superior vena cava , and is unchanged in appearance and location as compared to the prior chest x-ray . The heart size , mediastinal and hilar contours are normal . The lungs and pleural surfaces remain grossly clear except for a small nodular opacity in the left mid lung at the fourth anterior rib level , in a patient with known multiple small pulmonary nodules on prior CT torso of ___ . Skeletal structures are remarkable for postoperative changes in the lumbar spine .
    OUTPUT:
    
Similar appearance of left - sided porta catheter .