title: Traumatic leptomeningeal cyst in an adult: a case report and review of the literature.
abstract: BACKGROUND
  Traumatic leptomeningeal cyst as a complication of skull fractures was initially thought to occur primarily in the pediatric population. The occurrence of a traumatic leptomeningeal cyst in the adult population is rare.
  
  
  METHODS
  A lump in the right parietal region of this 53-year-old man prompted a computed tomography (CT) scan. The patient denied any symptoms and was in good health. Examination confirmed a firm, nontender, nonpulsatile mass in the right parietal region of the skull. The CT scan demonstrated a 4 x 3 cm area of irregular bone destruction involving both the inner and outer table of the skull. At operation a distinctly raised paper-thin outer table was noted, and underneath was a soft, tan-colored mass, which measured approximately 2 x 2 cm and was connected to the underlying brain through a 1 cm dural defect. The extradural portion of the mass was amputated, the dura repaired with a pericranium patch, the skull defect was repaired with a split thickness bone graft, and the final pathology was congruent with gliotic brain.
  
  
  CONCLUSIONS
  Although rare, this case demonstrates a traumatic leptomeningeal cyst in an adult.
authors.affiliation: Department of Neurological Surgery, University of Washington Medical Center, Seattle 98195, USA.
authors.forename: G W
authors.initials: GW
authors.lastname: Britz
authors.forename: D K
authors.initials: DK
authors.lastname: Kim
authors.forename: M R
authors.initials: MR
authors.lastname: Mayberg
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D012887:Skull Fractures / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D014057:Tomography, X-Ray Computed