system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All of the following are true about Ewing's sarcoma, EXCEPT
assistant
The correct answer is  (C) Common in 4th decade # Ewing sarcoma, a highly malignant primary bone tumor.> The tumor is derived from red bone marrow.> Most frequently, it is observed in children and adolescents aged 4-15 years and rarely develops in adults older than 30 years.> Ewing sarcoma is the second most common malignant bone tumor in young patients, and it is the most lethal bone tumor.> Typically, the periosteal reaction and new bone formation with an onionskin appearance may suggest the diagnosis of E wing sarcoma.> It is highly radiosensitive and it melts like ice but only to recur at a later date.