Letter to the Editor: Primary Extraosseous Ewing Sarcoma of the Right L5 Nerve Root Mimicking a Schwannoma. - Furusawa K; Ito J; Ichikawa Y; Yamazaki F; Narukama R; Nagoshi N; Nakayama R; Arai M; Isshiki K; Shimada H (Journal of pediatric hematology/oncology, 2026)