title: Ewing sarcoma mimicking a peripheral nerve sheath tumor.
abstract: We describe the first patient with an extradural, extramedullary Ewing's sarcoma tumor mimicking a nerve sheath tumor with no overt evidence of metastasis. A 28-year-old woman with no past medical history presented with a progressive 3-year history of low back pain and right-sided lower extremity radiculopathy after having failed conservative therapies. MRI of the lumbar spine revealed a right-sided enhancing, dumbbell-shaped lesion at the right neural foramen appearing to originate from the L4 nerve root, suspicious for a peripheral nerve sheath tumor or schwannoma. The patient and findings are discussed in the context of the literature, including an update on the relatively recent diagnostic redesignation of the Ewing's sarcoma family tumors.
authors.affiliation: Department of Neurosurgery, Baylor College of Medicine, 1709 Dryden Street, Suite 750, Houston, Texas 77030, USA. Bartley.Mitchell@bcm.tmc.edu
authors.forename: B D
authors.initials: BD
authors.lastname: Mitchell
authors.forename: B D
authors.initials: BD
authors.lastname: Fox
authors.forename: A
authors.initials: A
authors.lastname: Viswanathan
authors.forename: A H
authors.initials: AH
authors.lastname: Mitchell
authors.forename: S Z
authors.initials: SZ
authors.lastname: Powell
authors.forename: D A
authors.initials: DA
authors.lastname: Cech
mesh_terms: D000328:Adult; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000601:surgery; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D018317:Nerve Sheath Neoplasms / Q000503:physiopathology*; D012512:Sarcoma, Ewing / Q000175:diagnosis* / Q000601:surgery