title: Occipital post-traumatic intradiploic arachnoid cyst converted to pseudomeningocele after re-trauma: a rare complication of rare pathology.
abstract: BACKGROUND
  Growing skull fracture (GSF)/pseudomeningocele is a rare complication of head injury in children. Post-traumatic intradiploic arachnoid cyst (PTIAC) is a variant but it is extremely rare. PTIACs are usually asymptomatic or with mild symptoms like headache. The rupture of PTIAC due to re-trauma leading to pseudomeningocele formation has not been seen or reported before.
  
  
  METHODS
  We present a case of occipital PTIAC where pseudomeningocele developed after re-trauma, and discuss the pathogenesis and management.
  
  
  RESULTS
  En masse removal of the ruptured PTIAC was performed along with dural-defect repair. The post-operative recovery was good.
  
  
  CONCLUSIONS
  PTIAC is an extremely rare occurrence as a variant of GSF. It is usually asymptomatic, but it may rupture with trivial trauma due to a thinned-out outer table and then converts into pseudomengocele. En masse excision with dural-defect repair gives good results in cases of ruptured PTIAC due to re-trauma.
authors.affiliation: Department of Neurosurgery, SMS Medical College and Hospital, JLN Marg, Jaipur, India.
authors.forename: Manish
authors.initials: M
authors.lastname: Jaiswal
authors.forename: Ashok
authors.initials: A
authors.lastname: Gandhi
authors.forename: Achal
authors.initials: A
authors.lastname: Sharma
authors.forename: R S
authors.initials: RS
authors.lastname: Mittal
mesh_terms: D016080:Arachnoid Cysts / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D002675:Child, Preschool; D006801:Humans; D008297:Male; D008588:Meningocele / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D009777:Occipital Bone / Q000473:pathology* / Q000601:surgery; D012887:Skull Fractures / Q000150:complications / Q000175:diagnosis* / Q000601:surgery