Retroperitoneal fibrosis with duodenal stenosis

Retroperitoneal fibrosis is a rare disease characterized by the formation o f dense plaque of fibrous tissue covering the retroperitoneal structures. T his disease is commonly presented as ureteral obstruction, but the involvem ent of duodenum is rare. We report a case of retroperitoneal fibrosis which was complicated with duodenal stenosis and was successfully treated with c orticosteroids. A 58-yr-old man, who had history of aorto-iliac bypass graf t due to arteriosclerosis obliterans with infrarenal aortic occlusion was a dmitted to the hospital with abdominal pain and a mass. Abdominal CT scan r evealed the periaortic soft tissue mass encircling grafted aorta and stenos is of duodenal third portion. Retroperitoneal fibrosis with duodenal stenos is was diagnosed and prednisolone therapy was initiated. Follow-up CT scan showed that the patient responded to prednisolone therapy with eased pain, shrinking periaortic mass, and reduced duodenal stenosis.