title: [An unusual case of posterior mediastinal mass: extraosseus Ewing sarcoma].
authors.forename: M A
authors.initials: MA
authors.lastname: Martínez García
authors.forename: D
authors.initials: D
authors.lastname: Nauffal Manzur
authors.forename: P
authors.initials: P
authors.lastname: de la Cuadra García-Lliberós
mesh_terms: D000293:Adolescent; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis; D012512:Sarcoma, Ewing / Q000175:diagnosis