[Spontaneous hematoma and hip pain in a 65-year old patient].

The case of a 65-year-old woman with acquired hemophilia is reported. Acquired hemophilia is characterized by the development of inhibitors directed against coagulation factors. Impairment of plasmatic hemostasis leads to a severe bleeding tendency in individuals without a preexisting coagulation defect with considerable mortality. Pathophysiology, diagnostic work-up, and treatment are summarized and discussed.