Idiopathic retroperitoneal fibrosis in multifocal fibrosclerosis.

A case of rare combination of retroperitoneal fibrosis and Riedel's thyroiditis is presented. The term multifocal fibrosclerosis is used in the literature to denote such combination and others which include idiopathic retroperitoneal fibrosis, mediastinal fibrosis, sclerosing cholangitis, invasive (Riedel's) thyroiditis and pseudotumor of the orbit.