Retroperitoneal Ewing's sarcoma/embryonal tumor: a rare differential diagnosis of back pain

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Fabiano Reis; Eduardo Macedo; Marcondes Cavalcanti França Junior; Eliane Ingrid Amstalden; Simone Appenzeller

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This work is licensed under an Attribution 4.0 International License (CC BY 4.0), effective June 9, 2022. Previously, the journal was licensed under a Creative Commons Attribution - Non-Commercial - Share Alike 4.0 International License.

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