title: Gout tophus on an intradural fascicle: a case description.
abstract: Case report and review of literature.
  
  
  
  Detailed description of case and review of literature to determine its uniqueness with special regard to intradural gout tophus formation without any boney attachment or underlying systemic gout. Gout tophi commonly involve the peripheral joints of the upper and lower extremities. Rarely, gout tophi are located within the spinal cord, especially without any underlying hyperuricemia.
  
  
  
  We report the case of a 64-year-old patient presenting with radiculopathy along the right L2-dermatome and bladder dysfunction and review literature for further discussion.
  
  
  
  Imaging studies showed a partly calcified round intradural lesion at the level L2 without contrast enhancement. The lesion was removed via a hemilaminectomy L2. It was adherent to a dorsal sensory fascicle exiting with the L2 nerve root. The neuropathological examination showed a gout tophus. Serologic testing revealed no signs of hyperuricemia.
  
  
  
  To the best of our knowledge, this is the first report of a gout tophus originating from an intradural fascicle and without any boney attachment or underlying systemic gout. The literature is reviewed and possible pathophysiological mechanisms are discussed.
authors.affiliation: Department of Neurosurgery, University Hospital Würzburg, Josef-Schneider-Str. 11, 97080, Würzburg, Germany. Willner_N@ukw.de.
authors.forename: Nadine
authors.initials: N
authors.lastname: Willner
authors.affiliation: Department of Neuropathology, Institute of Pathology, Julius-Maximilian-University of Würzburg, Josef-Schneider-Str. 2, 97080, Würzburg, Germany.
authors.forename: Camelia-Maria
authors.initials: CM
authors.lastname: Monoranu
authors.affiliation: Department of Neurosurgery, University Hospital Würzburg, Josef-Schneider-Str. 11, 97080, Würzburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Stetter
authors.affiliation: Department of Neurosurgery, University Hospital Würzburg, Josef-Schneider-Str. 11, 97080, Würzburg, Germany.
authors.forename: Ralf-Ingo
authors.initials: RI
authors.lastname: Ernestus
authors.affiliation: Department of Neurosurgery, University Hospital Würzburg, Josef-Schneider-Str. 11, 97080, Würzburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Westermaier
mesh_terms: D002114:Calcinosis / Q000000981:diagnostic imaging / Q000473:pathology*; D004388:Dura Mater / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006073:Gout / Q000150:complications* / Q000175:diagnosis; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D011843:Radiculopathy / Q000209:etiology; D013126:Spinal Nerve Roots / Q000000981:diagnostic imaging / Q000473:pathology*; D001750:Urinary Bladder, Neurogenic / Q000209:etiology
keywords: CSF; Gout tophus; Intradural; Nerve fascicle; Uric acid