Iliopsoas hemorrhage, whether spontaneous or traumatic, is encountered in a variety of coagulation disorders, such as hemophilia and vWD, and in association with anti-coagulant drug treatments such as heparin, warfarin and ticlopidine; however, most cases of iliopsoas hemorrhage occur in patients with hemophilia [3], and the first case was reported by Tallroth in 1939 [4]. The gene discussed is VWF; the disease is hemophilia.