Brain Metastasis With a Solitary Lesion Secondary to Knee Joint Ewing Sarcoma: A Case Report.

Brain metastasis from Ewing sarcoma is rare and can present with various symptoms. We present a 21-year-old female who underwent surgery for Ewing sarcoma of the knee joint and, after six months, was reported with complaints of headache and vomiting. Considering recommended investigations, metastatic Ewing sarcoma of the brain was diagnosed, and a treatment protocol, such as a combination of surgery, chemotherapy, and radiation, was given. Our observation shows this is the first case reported with a solitary metastatic brain lesion associated with Ewing sarcoma.