title: Nonendodontic periapical lesions: a retrospective study in Chile.
abstract: OBJECTIVE
  To determine the frequency with which the histopathological diagnosis of periapical lesions contributes to a change in the clinical diagnosis.
  
  
  METHODS
  Cases having a clinical diagnosis of disease resulting from dental pulp necrosis were selected from the database of the Oral Pathology Reference Institute between 1975 and 2005. Cases with different histopathological diagnoses were determined and information about age and gender of the patient, location of associated tooth, pulp status and the histopathological diagnosis were recorded. The percentage of nonendodontic periapical lesions was then determined.
  
  
  RESULTS
  In the 30-year period, 32,423 [corrected] biopsy specimens were received. Overall 4006 (9.13%) had a clinical diagnosis of pulpal necrosis with associated pathosis in the periradicular area. Within this group, 26 cases (0.65%) had a histopathological diagnosis of nonendodontic pathology. Keratocystic odontogenic tumour was the most frequent nonendodontic lesion (11 cases) in the periradicular region followed by central giant cell granuloma (three cases), chronic sinusitis (three cases) and one case each of the following lesions: nasopalatine duct cyst, lateral periodontal cyst, calcifying cystic odontogenic tumour, ameloblastic fibroma, squamous odontogenic tumour, cemental dysplasia, haemangioma, foreign body cell granuloma and amalgam tattoo.
  
  
  CONCLUSIONS
  The histopathological study of periapical pathosis can occasionally reveal nonendodontic lesions. Odontogenic tumours made up the largest group.
authors: Department of Oral Pathology and Department of Endodontics, Faculty of Odontology, University of Chile, Santiago, Chile. aveortega@lycos.com
authors: A
authors: A
authors: Ortega
authors: V
authors: V
authors: Fariña
authors: A
authors: A
authors: Gallardo
authors: I
authors: I
authors: Espinoza
authors: S
authors: S
authors: Acosta
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002677:Chile / Q000453:epidemiology; D003790:Dental Pulp Necrosis / Q000150:complications* / Q000453:epidemiology; D005260:Female; D006801:Humans; D007573:Jaw Neoplasms / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D009808:Odontogenic Tumors / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D010483:Periapical Diseases / Q000453:epidemiology*; D012189:Retrospective Studies