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FIGURE 1. A 10-y-old boy, with osteosarcoma of left femoral metaphysis, received chemotherapy before and after surgery. He had marginal excision of tumor and bone transport with Ilizarov external fixator. (A) Radiograph shows callus formation in diaphysial distraction segment. (B) Blood-pool image and delayed image show increased activities in distraction segments. Increased activities are also shown in growth plates in both images. ROI was set on distraction segment and symmetric ROI was set on contralateral normal area as control. Uptake ratio of blood-pool image was 1.3, and uptake ratio of delayed image was 4.4.
