title: Distribution pattern of the adenomatoid odontogenic tumor: a retrospective study from the files of a government teaching hospital, Tamil Nadu, Chennai, India.
abstract: OBJECTIVE
  To determine the distribution and clinicopathologic characteristics of adenomatoid odontogenic tumors from Tamil Nadu, India, to provide meaningful data for comparison among different population groups, mainly in the Asian context.
  
  
  METHODS
  Forty-three adenomatoid odontogenic tumors were reviewed from 493 odontogenic tumors recorded between 1970 and 2008. The data pertaining to age, sex, anatomic site, associated impacted teeth and radiographic details, provisional diagnoses, and macroscopic and microscopic details of the 43 odontogenic tumors were reviewed.
  
  
  RESULTS
  The relative frequency of adenomatoid tumors comprised 8.72% of the total odontogenic tumors. The age range was 9-30 years, with a mean age of 16.88 years for combined adenomatoid odontogenic tumors. The mean age for other variants of adenomatoid odontogenic tumors assessed in this study differed slightly between sexes. Forty occurred within the bone and three peripherally. In general, the maxilla was the predominant site of involvement (72.5%), and the anterior region of jaw was affected in 92.5%. For combined adenomatoid odontogenic tumors, the male-to-female ratio was 1:1.26, and the maxilla-to-mandible ratio was 2.9:1. Microscopically, cystic lesions comprised 37.5% and occurred more often in males with a lower mean age.
  
  
  CONCLUSIONS
  The present study shows variations in the distribution of adenomatoid odontogenic tumors within the population assessed, but no definite conclusion emerged with regard to regional or ethnic effect.
authors.affiliation: Department of Oral and Maxillofacial Pathology, Tamil Nadu Government Dental College and Hospital, Chennai, India.
authors.forename: Sivasubramanian
authors.initials: S
authors.lastname: Arunaa
authors.forename: Irulandy
authors.initials: I
authors.lastname: Ponniah
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D007194:India / Q000453:epidemiology / Q000208:ethnology; D008297:Male; D008339:Mandibular Neoplasms / Q000453:epidemiology; D008441:Maxillary Neoplasms / Q000453:epidemiology; D009808:Odontogenic Tumors / Q000453:epidemiology* / Q000208:ethnology; D012189:Retrospective Studies; D012737:Sex Factors; D014095:Tooth, Impacted / Q000453:epidemiology; D055815:Young Adult
keywords: Asian; Dravidian; India; Tamil Nadu; adenomatoid odontogenic tumor