Figure 6: (a) Preoperative anteroposterior radiograph of the pelvis of a 38-year-old man who had MFH of bone in the acetabulum. (b) Gadolinium-enhanced axial T1-weighted MRI showing the tumor arising in the acetabulum. (c) Postoperative radiograph after reconstruction using a frozen bone autograft. (d) Follow-up radiograph 1.5 years after surgery showing osteoarthritis of the hip joint.