title: Osteosarcoma in 2 very young children.
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D004314:Down Syndrome / Q000150:complications; D005266:Femoral Neoplasms / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D009918:Orbital Neoplasms / Q000175:diagnosis* / Q000601:surgery; D012516:Osteosarcoma / Q000150:complications / Q000175:diagnosis* / Q000601:surgery