Fibrosis, an abnormal proliferation of collagen connective tissue, can be seen in any organ or body system. Retroperitoneal, pleural or mediastinal fibrosis are often present individually and with different types of etiopathogenesis. [1][2][3] In this group, retroperi-toneal fibrosis (RPF), or Ormond's disease which was initially defined in 1948 is the best known and most common form. 4 More than 70% of cases are idiopathic. 5 Only a few intrathoracic periaortic, pleural, or pericardial fibrosis cases accompany RPF in the