An unusual cause of bruising in an 80-year-old woman.

PRESENTATION: a previously fit 80-year-old woman presented with a 2-week history of spontaneous and extensive bruising affecting all four limbs. The severity was such that she required a transfusion of 8 units of blood. RESULTS OF INVESTIGATIONS: a markedly prolonged activated partial thromboplastin time which was only partially corrected with normal plasma; tests for lupus anticoagulant were negative. Factor VIII levels were reduced and the Bethesda assay indicated an acquired inhibitor to factor VIII. She was treated with a combination of intravenous immunoglobulin and immunosuppression. OUTCOME: the response to treatment was excellent, with a marked reduction in anti-factor VIII antibody levels and resolution of the bruising over the next few weeks.