Post‐transfusion purpura responding to high dose intravenous IgG: further observations on pathogenesis

Summary. A typical case of post‐transfusion purpura (PTP) is described in a 61‐year‐old woman. Treatment with steroids corrected the purpuric manifestations, but the patient remained thrombocytopenic in spite of steroid therapy and plasma exchange. However, an intravenous infusion of high dose IgG led to a rapid and sustained increase in the platelet count.