title: A case series of odontogenic keratocysts from a New Zealand population over a 20-year period.
abstract: OBJECTIVE
  To report on the clinicopathological aspects of odontogenic keratocysts (OKC)/keratocystic odontogenic tumours (KCOT) presenting in a New Zealand population.
  
  
  METHODS
  Information on defined areas--including age at presentation, gender, anatomical sub-location, presenting features, histological subtype and the recurrence pattern--were extracted from the histopathological data available in the Oral Pathology database of the University of Otago School of Dentistry.
  
  
  RESULTS
  Two hundred and twenty three cases of OKC/ KCOT were identified over the period ranging from 1987 to 2008. Mean age at presentation was 37.0 years (males 38.6 years, females 34.4 years), with 61.0% of cases being male. The mandible was the dominant jaw affected, with 65.9% of lesions, with the angle of mandible being the commonest anatomical sub-location (with 32.4% of lesions). One-fifth of the cases were asymptomatic incidental findings, while the majority of problems were related to the third molar tooth and/or pain and swelling. The overall recurrence rate was 18.3%, with the majority (62.2%) in the mandible and more males (67.5%) affected. Recurrence was highest in the first 5 years of follow-up, and decreased sharply thereafter.
  
  
  CONCLUSIONS
  This study is the first to describe the frequency, distribution, presentation and recurrence rates of OKC/KCOT in New Zealand and shows that these are similar to those reported from other populations.
authors.affiliation: Department of Oral Diagnostic and Surgical Sciences, University of Otago, Dunedin, New Zealand.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Jattan
authors.forename: Harsha L
authors.initials: HL
authors.lastname: De Silva
authors.forename: Rohana Kumara
authors.initials: RK
authors.lastname: De Silva
authors.forename: Alison M
authors.initials: AM
authors.lastname: Rich
authors.forename: Robert M
authors.initials: RM
authors.lastname: Love
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008336:Mandibular Diseases / Q000453:epidemiology* / Q000473:pathology / Q000628:therapy; D008439:Maxillary Diseases / Q000453:epidemiology* / Q000473:pathology / Q000628:therapy; D008875:Middle Aged; D009520:New Zealand / Q000453:epidemiology; D009807:Odontogenic Cysts / Q000453:epidemiology* / Q000473:pathology / Q000628:therapy; D012008:Recurrence; D012189:Retrospective Studies; D017678:Sex Distribution; D055815:Young Adult