Insights Into Non‐Classic Primary Bone Sarcomas in Children, Adolescents, and Young Adults: A French Descriptive Study

Non-classic primary bone sarcomas in children and AYA are extremely rare. Adamantinomas have an excellent outcome. Chordomas exhibit local aggressiveness and high recurrence rates, with a need to improve local control and systemic treatments. Other tumors are mainly undifferentiated sarcomas and have a poor prognosis, and no consensus as to adequate systemic treatment.