title: A retrospective review of 61 cases of adenomatoid odontogenic tumour seen in five tertiary health facilities in Nigeria.
abstract: BACKGROUND
  Adenomatoid odontogenic tumor (AOT) is a benign lesion originating from the dental lamina or its remnants. It is a relatively uncommon neoplasm representing about 3% of all odontogenic tumors. The aim of this study was to examine the clinical and radiological characteristics of AOTs in five major tertiary centres in Nigeria.
  
  
  METHODS
  Archival hospital-based data stores of five tertiary health facilities in Nigeria were accessed. Case files and biopsy records were retrieved to obtain relevant information. Data was collected according to a proforma for standardization and entered into and analysed using SPSS for Windows (version 20.0; SPSS Inc. Chicago, IL).
  
  
  RESULTS
  61 (4.5%) cases of AOT were documented. The age range was 8-46 years with a mean age of 20.4±9.9 years. Male: Female ratio was 1:1.3. The anterior maxilla had 34 (55.8%) cases and the anterior mandible had 20 (32.8%) cases. 40 (65.6%) follicular cases, 20 (32.8%) extra-follicular cases and 1(1.6%) extra-osseous case were found. 31 cases (61.1%) were associated with impacted teeth and the upper canine was involved in 19 (57.6%) cases.
  
  
  CONCLUSIONS
  This study showed AOT to be more common in the maxilla, more in females, most often associated with impacted canines, however, the suggestion of AOT being a "Two third tumour" was not observed in this study.
authors.affiliation: Department of Oral Pathology, College of Medicine, University of Ibadan, Ibadan, Nigeria.
authors.forename: Akinyele Olumuyiwa
authors.initials: AO
authors.lastname: Adisa
authors.affiliation: Department of Oral Pathology, College of Medicine, University of Ibadan, Ibadan, Nigeria.
authors.forename: Ahmed Oluwatoyin
authors.initials: AO
authors.lastname: Lawal
authors.affiliation: Department of Oral and Maxillofacial Pathology & Biology, College of Medicine, University of Lagos, Lagos, Nigeria.
authors.forename: Olajumoke Ajibola
authors.initials: OA
authors.lastname: Effiom
authors.affiliation: Department of Oral Maxillo-facial Surgery and Oral Pathology, Obafemi Awolowo University, Ile-Ife, Nigeria.
authors.forename: Olujide Oladele
authors.initials: OO
authors.lastname: Soyele
authors.affiliation: Department of Oral Pathology and Biology, University of Port Harcourt, Port Harcourt, Nigeria.
authors.forename: Olufemi Gbenga
authors.initials: OG
authors.lastname: Omitola
authors.affiliation: Department of Oral and Maxillofacial Pathology & Biology, College of Medicine, University of Lagos, Lagos, Nigeria.
authors.forename: Adetokunbo
authors.initials: A
authors.lastname: Olawuyi
authors.affiliation: Maxillofacial Surgery Departments, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Fomete
mesh_terms: D000293:Adolescent; D000328:Adult; D000564:Ameloblastoma / Q000453:epidemiology* / Q000473:pathology; D001706:Biopsy; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000453:epidemiology* / Q000473:pathology; D008441:Maxillary Neoplasms / Q000453:epidemiology* / Q000473:pathology; D008875:Middle Aged; D009549:Nigeria / Q000453:epidemiology; D012189:Retrospective Studies; D017678:Sex Distribution; D055815:Young Adult
keywords: Adenomatoid odontogenic tumour; impacted teeth; radiology