Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate left apical pneumothorax is unchanged measuring 18 mm . However , there is a new left basal component which is also moderate measuring 29 mm . Right lung is unremarkable . Left lower lung opacity is due to known mass .
    OUTPUT:
    
New moderate left basal pneumothorax after chest tube removal . Left moderate apical component of pneumothorax is unchanged .