title: Filum ependymoma mimicking spontaneous intracranial hypotension.
abstract: A 34-year-old man with a 2-week history of orthostatic headaches and a "dry tap" at lumbar puncture was found to have a lumbar intradural mass on magnetic resonance imaging (MRI) examination. A myxopapillary ependymoma was resected and the patient's headache completely resolved. The combination of spontaneous orthostatic headaches and a "dry tap" at the time of lumbar puncture does not always indicate the presence of a spontaneous cerebrospinal fluid (CSF) leak and intracranial hypotension.
authors.affiliation: Maxine Dunitz Neurosurgical Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.
authors.forename: Wouter I
authors.initials: WI
authors.lastname: Schievink
authors.forename: Sergey E
authors.initials: SE
authors.lastname: Akopov
mesh_terms: D003937:Diagnosis, Differential; D004806:Ependymoma / Q000150:complications / Q000175:diagnosis*; D006261:Headache / Q000209:etiology*; D006801:Humans; D019585:Intracranial Hypotension / Q000175:diagnosis*; D008297:Male; D011187:Posture; D013125:Spinal Neoplasms / Q000150:complications / Q000175:diagnosis*