title: Trigeminal neuralgia in a patient with Dandy-Walker malformation.
abstract: BACKGROUND
  Trigeminal neuralgia may be idiopathic or secondary to a number of cranial pathologies. We report a novel case of trigeminal neuralgia associated with Dandy-Walker malformation, which may be an etiologic factor.
  
  
  METHODS
  A 32-year-old male presented with shock-like pain in the somatosensory distribution of the right trigeminal nerve, which was refractory to all medication. MRI revealed a cystic lesion in the posterior fossa and a hypoplastic vermis. The pain was diagnosed as trigeminal neuralgia and was thought to be secondary to the Dandy-Walker malformation. The trigeminal neuralgia was treated successfully with radiofrequency thermocoagulation rhizotomy (RF-TR).
  
  
  CONCLUSIONS
  Trigeminal neuralgia may be associated with Dandy-Walker malformation, however an etiological relationship is not proven. We suggest that traction on the trigeminal nerve may be significant. The posterior fossa cyst of Dandy-Walker malformation may be a complicating factor when considering microvascular decompression to treat the trigeminal neuralgia. Collapse of the cyst at surgery may destabilize the posterior fossa and further deform the trigeminal nerve. We suggest that RF-TR, which is minimally invasive and reliable, may be preferable.
authors.affiliation: Ankara University, Faculty of Medicine, Department of Neurosurgery, Ankara, Turkey. hasanugur2001@hotmail.com
authors.forename: Hasan Caglar
authors.initials: HC
authors.lastname: Ugur
authors.forename: Fuat
authors.initials: F
authors.lastname: Torun
authors.forename: Erdal
authors.initials: E
authors.lastname: Yilmaz
authors.forename: Yucel
authors.initials: Y
authors.lastname: Kanpolat
mesh_terms: D000328:Adult; D003616:Dandy-Walker Syndrome / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D014057:Tomography, X-Ray Computed / Q000379:methods; D014277:Trigeminal Neuralgia / Q000150:complications* / Q000000981:diagnostic imaging