A 63-year-old woman fell and sustained a rib fracture 2 years ago, fractures of the lumbar spine the next year and had difficulty walking. TIO due to colon cancer has been reported previously,[1] but enhanced computed tomography (CT) and colonoscopy indicated no abnormalities. We suspected a right thigh lesion, and magnetic resonance imaging revealed a mass lesion in the right femur (Figure 1C).