title: Polyangiitis overlap syndrome: a useful subgroup.
mesh_terms: D000368:Aged; D001706:Biopsy; D005260:Female; D013700:Giant Cell Arteritis / Q000175:diagnosis; D006801:Humans; D013577:Syndrome; D013699:Temporal Arteries / Q000473:pathology; D014657:Vasculitis / Q000175:diagnosis*