<unk>  and idiopathic<unk>  are disorders of unknown aetiology, characterised by fibrous lesions (co-)occurring at a variety of sites. Known manifestations include retroperitoneal fibrosis, mediastinal fibrosis and Riedel's thyroiditis. They are now considered to be manifestations of IgG4-related disease.
Multifocal fibrosclerosis
Eruptive pseudoangiomatosis
Obliterating endarteritis
Perforating calcific elastosis
Reactive perforating collagenosis
Arteriosclerosis obliterans
Proliferating angioendotheliomatosis
Nodular vasculitis