title: Image of the month--quiz case. Retroperitoneal extraskeletal Ewing sarcoma.
authors.affiliation: Digestive Surgery Unit, Department of Surgical Sciences, Catholic University School of Medicine, Rome, Italy.
authors.forename: Fausto
authors.initials: F
authors.lastname: Rosa
authors.forename: Antonio Pio
authors.initials: AP
authors.lastname: Tortorelli
authors.forename: Valerio
authors.initials: V
authors.lastname: Papa
authors.forename: Fabio
authors.initials: F
authors.lastname: Pacelli
authors.forename: Giovanni Battista
authors.initials: GB
authors.lastname: Doglietto
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000628:therapy; D012512:Sarcoma, Ewing / Q000000981:diagnostic imaging* / Q000473:pathology / Q000628:therapy; D014057:Tomography, X-Ray Computed