Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal upright view of the chest redemonstrates a moderate left pneumothorax , relatively unchanged in size compared to the prior study . A pigtail catheter through a left lateral approach terminates in the axilla . Cardiomediastinal contour is unchanged . Mild pulmonary edema is again noted . Increased opacification at the left and right base are unchanged and likely reflect atelectasis .
    OUTPUT:
    
1 . Moderate left pneumothorax , unchanged in size and distribution compared to the prior study . 2 . Left pigtail catheter terminates in the axilla and does not enter the pleural cavity and needs to be repositioned .