List six causes of diffuse (widespread) extraosseous uptake

1. Poor radiopharmaceutical preparation (free Tc-99m seen in the salivary glands, thyroid gland, and stomach)
2. Recent nuclear medicine examination (location depends on agent)
3. Renal failure
4. Metastases from breast tumors, ovarian tumors, lung tumors, or osteosarcoma
5. Lymphedema
6. Myositis ossificans