Hello and hope you are doing well.
It could be that the fibrotic band is due to an old tuberculous lesion and this could have caused the spontaneous pneumothorax. Pneumothorax is collection of air in the pleural space. Since, you have undergone chemical treatment, wherein the pleural space is approximated, recurrent pneumothorax is unlikely to occur. Hope any evidence of active tuberculosis has been ruled out.
Hope this helped and do keep us posted.
Please any1 ..who can put sme picture on above asked question