title: Clinical Characteristics of Odontogenic Cutaneous Fistulas.
abstract: BACKGROUND
  Odontogenic cutaneous fistula appears as dimpling or a nodule with purulent discharge, usually in the chin or jaw. Affected patients usually seek help from dermatologists or surgeons rather than from dentists. However, clinical symptoms of facial skin fistula without dental problems can lead to misdiagnosis.
  
  
  OBJECTIVE
  The purpose of this study was to investigate the clinical characteristics of patients with odontogenic cutaneous fistulas.
  
  
  METHODS
  This retrospective observational study was performed at Chungbuk National University Hospital by analyzing patients who visited from April 1994 to September 2014. Following clinical and radiographic examinations, the paths and origins of sinus fistulas were determined. Investigated factors were gender, age, morphology, location, originating tooth, time to evolution, recurrence, and treatment method.
  
  
  RESULTS
  Thirty-three patients (22 males, 11 females; average age 49.2 years) were examined during the investigation period. Thirty-four fistulas were diagnosed as odontogenic cutaneous fistulas. The most common morphology was dimpling (n=14, 41.2%). The various locations observed were related to the originating tooth. The most common site was the mandibular body related to mandibular molars. The referral clinical diagnosis was of odontogenic origin in 6 cases (18.2%). The majority of patients had experienced recurrence after treatment in previous clinics that had failed to diagnose odontogenic cutaneous fistula. Surgical fistulectomy and/or tooth treatment were performed in all cases. All patients were followed-up for 1 year. None showed signs of recurrence.
  
  
  CONCLUSIONS
  Extraoral and dental examinations are required to make a diagnosis of odontogenic cutaneous fistula. Thus, cooperation between dermatologists and dentists is essential.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Eun-Young
authors.initials: EY
authors.lastname: Lee
authors.affiliation: Department of Oral and Maxillofacial Surgery, Dongtan Sacred Heart Hospital, Hallym University, Hwaseong, Korea.
authors.forename: Ji-Yeon
authors.initials: JY
authors.lastname: Kang
authors.affiliation: Department of Oral and Maxillofacial Surgery, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Kyung-Won
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Department of Dermatology, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Ki Hwa
authors.initials: KH
authors.lastname: Choi
authors.affiliation: Department of Dermatology, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Tae Young
authors.initials: TY
authors.lastname: Yoon
authors.affiliation: Department of Dermatology, Chungbuk National University College of Medicine, Cheongju, Korea.
authors.forename: Ji Yeoun
authors.initials: JY
authors.lastname: Lee
keywords: Cutaneous; Fistula; Odontogenic; Tooth