“…There have been only nine reported cases in the world literature (Table 1) [2,5,8,9,10,11,18,19], and most authors concluded that osteosarcoma in the setting of OI occurred as a sporadic, rather than a related, event. More important, however, is the fact that osteosarcoma is difficult to diagnose in patients with OI, which was Factors that have been proposed as possible etiological agents in primary bone tumors are radiation, viruses, chemical carcinogens, metal implants, and trauma [17].…”