A13-year-old girl and her father come in to the local health clinic hoping to see an orthopedic doctor about the girl's stiff and warm knee. the father reports that she hurt it sliding into base during a softball game, and the daughter concurs, but with further discussion it becomes clear that the slide made an existing pain worse. her knee had been stiff, warm, and shiny, and had been keeping her awake at night for a week or so before the game. what might be the cause of the girl's symptoms?

Osteosarcoma

Explanation:

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question the most likely cause of her symptoms would be Osteosarcoma. Which is a type of bone cancer that starts off in the cells that make up our bones. This is one of the most common cancers, especially in children, and symptoms include localized bone pain and swelling.

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