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A 28-year-old man with papillary thyroid cancer underwent bone scintigraphy to assess possible osseous metastasis. He had vigorous workouts 5 days prior, which involved pectorals, rectus abdominis, quadriceps, and glutei. However, the images only showed increased activity in the rectus abdominis, whereas other involved muscles had no obvious uptake. No lesion in the bone was identified.