title: Primary Ewing sarcoma of lumbar spine in an 8-year-old boy:  a case report.
abstract: Primary Ewing's sarcoma of the mobile spine is rare, but nevertheless, is the second most common primary malignant bone neoplasm in children. Furthermore, in contrast to long bone involvement, delays may occur because symptoms may not be present until neurological deficits occur. Here, we report a case of an 8-year-old boy with lower back pain and radicular pain on the posterior lower extremities with tingling and progressively reduced sensation in both feet. The patient initially seemed to have muscle sprain but was eventually diagnosed with Ewing's sarcoma of the L5 vertebra with intraspinal extension.
authors.affiliation: Department of Orthopaedic Surgery, Jeju National University College of Medicine, Jeju, Korea.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Choi
authors.forename: Sung Jin
authors.initials: SJ
authors.lastname: Shin
authors.forename: Kwang Woo
authors.initials: KW
authors.lastname: Nam
authors.forename: Kyu Bum
authors.initials: KB
authors.lastname: Seo
authors.forename: Gyeong Min
authors.initials: GM
authors.lastname: Kim
mesh_terms: D002648:Child; D003131:Combined Modality Therapy; D006801:Humans; D007796:Laminectomy; D008159:Lumbar Vertebrae / Q000473:pathology*; D008297:Male; D011859:Radiography; D012512:Sarcoma, Ewing / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000628:therapy; D013125:Spinal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000628:therapy; D016896:Treatment Outcome