Retroperitoneal fibrosis (RPF) is a condition characterized by the presence of aberrant, nonspecific fibro-inflammatory tissue forming around retroperitoneal structures, enclosing them to a variable degree. These structures include the abdominal aorta, inferior vena cava and ureters. Although it can have a variety of etiologies, and can therefore be considered secondary, in over 70% of cases it remains idiopathic, and can be associated with a number...