title: Temporal dermoid cyst with a partial dermal sinus tract.
abstract: BACKGROUND
  Cranial dermal sinuses are rare and occur most frequently in the posterior fossa and along the midline. Likewise, supratentorial dermoid cysts are very uncommon.
  
  
  METHODS
  We report a unique case of an adult female patient with both a supratentorial dermoid cyst and an incomplete dermal sinus tract.
  
  
  RESULTS
  The patient is a 31-year-old female, who presented with a new onset complex partial seizure. Neuroimaging and surgery revealed a right superior temporal dermoid cyst with an associated dermal sinus tract. Furthermore, the dermal sinus tract was incomplete and had no cutaneous manifestations.
  
  
  CONCLUSIONS
  We present a rare patient with an off midline supratentorial dermoid cyst associated with a uniquely incomplete cranial dermal sinus tract. The dermal sinus tract involved the bone, dura and intradural compartment, without involving the overlying skin. This represents a novel variant in the spectrum of cranial dermal sinus abnormalities.
authors.affiliation: Division of Neurosurgery, Montreal General Hospital, McGill University, Quebec, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Shehadi
authors.forename: I A
authors.initials: IA
authors.lastname: Alorainy
authors.forename: K M
authors.initials: KM
authors.lastname: Johnston
mesh_terms: D000328:Adult; D003884:Dermoid Cyst / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D017029:Epilepsy, Complex Partial / Q000209:etiology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D016136:Spina Bifida Occulta / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D015173:Supratentorial Neoplasms / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D013701:Temporal Bone / Q000002:abnormalities / Q000473:pathology; D014057:Tomography, X-Ray Computed