Fig. 2.

Male, 18yrs, Primary Malignancy in Giant Cell Tumor of Bone. Anteroposterior hip joint radiograph (Fig. 2-A) showing osteolytic lesion at the left proximal femur, illustrating the well-circumscribed margin without sclerotic rim in the epiphyses and soft tissue mass adjacent to expanded cortical bone. CT-scan (Fig. 2-B) demonstrating a more clearly visible osteolytic lesion without mineralization, soft tissue mass breaks through the cortical bone with obvious enhancement.