title: Ewing's sarcoma of the hip presenting as a benign cystic lesion.
abstract: A 14-year-old girl with a Ewing's sarcoma of the left femoral head and neck is presented. The imaging features mimicked a benign cystic lesion. Biopsy and molecular analysis confirmed the diagnosis. The patient was treated with chemotherapy, wide tumor resection, and proximal femoral reconstruction using an allograft-prosthesis composite. Differential diagnosis, imaging, and pathologic features of Ewing's sarcoma are discussed.
authors.affiliation: Athens University Medical School, Neo Psychikon, Athens, Greece. pjp@hol.gr
authors.forename: Panayiotis J
authors.initials: PJ
authors.lastname: Papagelopoulos
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Mavrogenis
authors.forename: Ioannis S
authors.initials: IS
authors.lastname: Benetos
authors.forename: Kleo
authors.initials: K
authors.lastname: Papaparaskeva
authors.forename: Evanthia C
authors.initials: EC
authors.lastname: Galanis
authors.forename: Panayotis N
authors.initials: PN
authors.lastname: Soucacos
mesh_terms: D000293:Adolescent; D000970:Antineoplastic Agents / Q000627:therapeutic use; D001483:Base Sequence; D001859:Bone Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000601:surgery; D003131:Combined Modality Therapy; D003937:Diagnosis, Differential; D005260:Female; D006615:Hip / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008969:Molecular Sequence Data; D015514:Oncogene Proteins, Fusion / Q000235:genetics; D051789:Proto-Oncogene Protein c-fli-1 / Q000235:genetics; D034802:RNA-Binding Protein EWS; D011859:Radiography; D012512:Sarcoma, Ewing / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000601:surgery
chemical_list: D000970:Antineoplastic Agents; C106031:EWS-FLI fusion protein; D015514:Oncogene Proteins, Fusion; D051789:Proto-Oncogene Protein c-fli-1; D034802:RNA-Binding Protein EWS