Peri-aneurysmal retroperitoneal fibrosis

Perianeurysmal retroperitoneal fibrosis is a subtype of a spectrum of retroperitoneal fibrosis. It is characterized by association with an inflammatory aneurysm, adventitial and periadventitial inflammation, medial thinning and chronic retroperitoneal inflammatory process which is associated with a varying degree of fibrotic reactions surrounding the abdominal aorta.