title: Chemocauterization of the internal opening with trichloroacetic acid as first-line treatment for pyriform sinus fistula.
abstract: BACKGROUND
  Pyriform sinus fistula is a rare brachial pouch anomaly. However, it is difficult and risky to remove the fistula tract completely. Circumferential chemocauterization of the internal opening with trichloroacetic acid (TCA) for pyriform sinus fistula is simple, reproducible, reliable, and causes less morbidity. The aim of this study was to determine the feasibility of TCA chemocauterization for pyriform sinus fistula.
  
  
  METHODS
  This retrospective study enrolled 44 patients who were diagnosed with pyriform sinus fistula and underwent TCA chemocauterization. We retrospectively reviewed the medical records of the patients to obtain their demography as well as treatment outcomes for them.
  
  
  RESULTS
  The success rate of treatment for pyriform sinus fistula after the first TCA chemocauterization was 77.3% (34/44) and the cumulative success rate after the second treatment was 93.2% (41/44). There was no complication such as vocal fold palsy after TCA chemocauterization.
  
  
  CONCLUSIONS
  It is suggested that TCA chemocauterization can be a reasonable first-line treatment for pyriform sinus fistula.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea.
authors.forename: Wonjae
authors.initials: W
authors.lastname: Cha
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Cho
authors.forename: J Hun
authors.initials: JH
authors.lastname: Hah
authors.forename: Tack-Kyun
authors.initials: TK
authors.lastname: Kwon
authors.forename: Myung-Whun
authors.initials: MW
authors.lastname: Sung
authors.forename: Kwang Hyun
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D002425:Cautery / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D004945:Esophagoscopy; D005240:Feasibility Studies; D005260:Female; D005402:Fistula / Q000188:drug therapy / Q000601:surgery*; D006801:Humans; D007828:Laryngoscopy; D008297:Male; D008875:Middle Aged; D056144:Pyriform Sinus / Q000473:pathology* / Q000601:surgery*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014238:Trichloroacetic Acid / Q000627:therapeutic use*; D055815:Young Adult
chemical_list: D014238:Trichloroacetic Acid