Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior examination , a right - sided pigtail catheter has been placed . The right lung has re-expanded . Small residual right apical pneumothorax is suspected . Rounded right apical mass is again noted as well as vague opacity in the adjacent right upper lung slightly more inferiorly with fiducial marker in place . Otherwise , no change .
    OUTPUT:
    
Status post right pigtail catheter placement . Small persistent right apical pneumothorax suspected .