[Occurrence of subdural hematoma closely associated with danazol administration in a patient with refractory ITP].

We reported a 34-year-old female patient with refractory idiopathic thrombocytopenic purpura (ITP) in whom a subacute subdural hematoma occurred without any preceding trauma during danazol administration which resulted in a marked decrease of plasma fibrinogen level. It is strongly suggested that danazol should be very carefully administered in ITP patients with serious bleeding tendency.