Acquired Factor VIII-Specific Antibody Disorder Accompanied by a Life-Threatening Retroperitoneal Hematoma.

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Abstract
A male patient, aged 58, without any discernible underlying disease developed a massive hemorrhage in the retroperitoneal cavity and in the femoral muscle. The hemorrhagic tendency of the patient was found to be due to the acquired anti-Factor VIII specific autoantibody in the blood. A concentrate of an activated prothrombin complex (FEIBA: Factor eight inhibitor bypassing activity) was administered and produced a remarkable effect in stemning the bleeding tendency of the patient. Immunosuppressive therapy was also effective for the control of the bleeding.