What are benign primitive bone tumors?

Can behave in a variable way: ➢ Quiescent ➢ Active ➢ Locally Aggressive Osteoid osteoma: ➢ Relatively common, young patient (child, adolescent, young adult). ➢ Severe nocturnal pain that is relieved by aspirin and other nonsteroidal anti- inflammatory agents. ➢ Typical imaging in standard radiography and CT show the <<nidus » : clear gap with central condensation ➢ Size less than 2 cm, surrounded by reactive bone sclerosis (CT) and by edema (MRI). ➢ Most often, a biopsy is not necessary for diagnosis Osteoid osteomas most commonly arise in the second or third decade. They involve most often the femur or tibia