Outdated UW Question

On reviewing questions, I came across QID 2320 which had a box before the question which states that it contains "outdated or inaccurate information" and to ignore the question. I can't figure out what is wrong with the question though. It is osteosarcoma in a teenager who has some bone pain and they show a picture of an X-ray where they show an osteolytic lesion and Codman's triangle. It states that osteosarcoma is the most common primary bone tumor in children. All that sounds right to me?
Source: Student Doctor Network Forums - Category: Universities & Medical Training Authors: Tags: Step II Source Type: forums