Polyarteritis nodosa complicated by antiphospholipid syndrome.

Polyarteritis nodosa is a necrotizing vasculitis of small and medium-sized arteries that spares the smallest blood vessels (arterioles, venules, and capillaries). Antiphospholipid syndrome is an autoimmune disorder characterized by venous or arterial thrombosis and/or by fetal losses, associated with antiphospholipid antibodies. The association of both diseases is infrequent. This case report discusses a male patient with a diagnosis of polyarteritis nodosa who, after 7 years of being diagnosed with vasculitis, showed ischemic lesions in his legs associated with high titers of anticardiolipin antibodies, along with angiographic and histologic evidence of thrombosis. Despite immunosuppressive and anticoagulant therapy, his lesions progressed, and both legs had to be amputated.