Abstract
We report a 17-year-old male who presented iliopsoas hematoma as the first manifestation of hemophilia A. At the initial examination he complained of severe pain around his right anterior hip joint, and then gait disturbance. The iliopsoas position suggested the presence of iliopsoas myositis or related diseases. After considering all clinical and laboratory findings including coagulation factor VIII, we diagnosed his case as hemophilia A with difficulty. He was treated with replacement therapy. The clinical course was favorable and he returned to high school life. Only a few such cases have been reported previously. If iliopsoas hematoma is suspected, it is important that the orthopaedic surgeon investigates a blood coagulative disorder as soon as possible.
