title: Nasal dermoids in children: a proposal for a new classification based on 103 cases at Great Ormond Street Hospital.
abstract: OBJECTIVE
  Nasal dermoids are rare developmental anomalies seen in children. This study reports the largest case series of 103 patients seen in a quaternary specialist unit over a 10-year period. We report the surgical and radiological findings and propose a new classification system, which clearly describes the extent of the lesions, thus allowing better surgical planning.
  
  
  METHODS
  A retrospective review of case notes was conducted. Data collection included demographics, initial presentation, site of lesion, pre-operative CT and MRI imaging, surgical procedure, intraoperative findings (including depth of lesion), complications and recurrence. Surgical findings were correlated with radiological findings.
  
  
  RESULTS
  A total of 103 patients were included in the study. The mean age at presentation was 29 months. 89% of children presented with a naso-glabellar or columellar lesion and 11% had a medial canthal lesion. All the patients underwent preoperative imaging and were treated with surgical excision. 58 children had superficial lesions, 45 had subcutaneous tracts extending to varying depths. Of these, 38 had intraosseous extension into the frontonasal bones, eight extended intracranially but remained extradural and two had intradural extension. There was good correlation between radiological and surgical findings. The superficial lesions were locally excised. The lesions with intraosseous tracts were removed via open rhinoplasty and the frontonasal bones drilled for access. Intracranial extension was approached either via a bicoronal flap and frontal craniotomy or the less invasive anterior small window craniotomy.
  
  
  CONCLUSIONS
  This report describes the largest published cases series of nasal dermoids. The cases demonstrate the presenting features and the variable extent of the lesions. The new proposed classification; superficial, intraosseous, intracranial extradural and intracranial intradural, allows precise surgical planning. In the presence of intracranial extension, the low morbidity technique of using a brow incision and small window anterior craniotomy avoids the more invasive and commonly used bicoronal flap and frontal craniotomy.
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: B E J
authors.initials: BE
authors.lastname: Hartley
authors.affiliation: Great Ormond Street Hospital, United Kingdom. Electronic address: nnekaeze@yahoo.co.uk.
authors.forename: N
authors.initials: N
authors.lastname: Eze
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Trozzi
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Toma
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Hewitt
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Jephson
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: L
authors.initials: L
authors.lastname: Cochrane
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Wyatt
authors.affiliation: Great Ormond Street Hospital, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Albert
mesh_terms: D002675:Child, Preschool; D003884:Dermoid Cyst / Q000145:classification* / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging; D008297:Male; D009669:Nose Neoplasms / Q000145:classification* / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D012225:Rhinoplasty; D014057:Tomography, X-Ray Computed
keywords: Classification; Nasal dermoid; Paediatric