Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright frontal chest radiograph demonstrates a small apical pneumothorax . A right chest tube is unchanged in position . A superior vena cava stent remains in place . A left IJ catheter tip is positioned at the cavoatrial junction , a right subclavian central venous catheter tip is positioned in the lower SVC , just beyond the SVC stent . Lung volumes are low , bibasilar atelectasis is resolving . The pulmonary vasculature is normal , and there is interval improvement in azygous distention . The cardiac silhouette and mediastinal contours are unchanged .
    OUTPUT:
    
1 . Small right apical pneumothorax , right chest tube is unchanged in position . 2 . Low lung volumes , with resolving bibasilar atelectasis .