title: The incidence of Warthin tumours and pleomorphic adenomas in the parotid gland over a 25-year period.
abstract: OBJECTIVE
  Pleomorphic adenoma (PA) is reported to be the most common benign parotid tumour followed by Warthin tumour (WT), but the proportion of these two entities might have changed.
  
  
  METHODS
  Retrospective file analysis.
  
  
  METHODS
  Tertiary referral head and neck centre.
  
  
  METHODS
  Patients who underwent a parotidectomy within a period of 25 years (1990-2014).
  
  
  METHODS
  Rate of occurrence of PA and WT as well as the development of the PA/WT ratio over the years.
  
  
  RESULTS
  Overall, 1818 patients with WT (707, 38.9%) and PA (1111, 61.1%) were identified. There was a dominance of PA over WT in all years. An increase in percentage of WT, from 24% in 1990 to 48% in 2014, in comparison with PA was evident.
  
  
  CONCLUSIONS
  In our single-institution hospital-based material of parotidectomies, the percentage of WT in comparison with PA has significantly increased over the last 25 years.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, Cologne, Germany.
authors.forename: J C
authors.initials: JC
authors.lastname: Luers
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, Jena University Hospital, Jena, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Guntinas-Lichius
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Giessen, Giessen, Germany.
authors.forename: J P
authors.initials: JP
authors.lastname: Klussmann
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, Cologne, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Küsgen
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, Cologne, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Beutner
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, Cologne, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Grosheva
mesh_terms: D000235:Adenolymphoma / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D008949:Adenoma, Pleomorphic / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D010307:Parotid Neoplasms / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D012189:Retrospective Studies