title: Choice of approach for revision surgery in cases with recurring chronic otitis media with cholesteatoma after the canal wall up procedure.
abstract: OBJECTIVE
  Cholesteatoma has a tendency to recur if not properly eradicated. This study sought to investigate and compare the outcome of the canal wall up (CWU) versus the canal wall down (CWD) procedure for recurrent cholesteatoma after initial canal preserving surgery.
  
  
  METHODS
  Between January 1990 and August 2007, 42 patients who underwent a revision tympanomastoidectomy for a recurred cholesteatoma were analyzed retrospectively. All patients initially underwent the canal wall up procedure. Recurrence rates, audiologic outcomes, and the extent of recurrent/residual cholesteatoma were investigated, and the revision surgical methods were compared.
  
  
  RESULTS
  The mean follow-up duration was 10 years (range, 13 months-15.6 years). The CWD procedure was performed in 29 (69%) patients with a recurred cholesteatoma and the CWU procedure in 13 (31%) as a first revision procedure. CWD surgeries were performed in more severe cases. A second revision surgery was required in five (12%) patients. Extended cholesteatoma recurrences were observed even among cases with a lower disease stage at the time of primary surgery. The second recurrence rate was significantly higher in the CWU group than the CWD group (p=0.026). The 8-year disease-free follow-up rate in the CWD group was significantly higher than the CWU group (p=0.002). Postoperative AB gap closure was significantly better in the CWU group than CWD group (p=0.001).
  
  
  CONCLUSIONS
  The CWD procedure is a safer and more successful method for controlling recurrent cholesteatoma. Thus, surgeons should not be hesitant to perform the CWD procedures for revision cases.
authors.affiliation: Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea.
authors.forename: Kyung Tae
authors.initials: KT
authors.lastname: Park
authors.forename: Jae-Jin
authors.initials: JJ
authors.lastname: Song
authors.forename: Sung Joong
authors.initials: SJ
authors.lastname: Moon
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Lee
authors.forename: Sun O
authors.initials: SO
authors.lastname: Chang
authors.forename: Seung Ha
authors.initials: SH
authors.lastname: Oh
mesh_terms: D000328:Adult; D000368:Aged; D018424:Cholesteatoma, Middle Ear / Q000601:surgery*; D004424:Ear Canal / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010033:Otitis Media / Q000601:surgery*; D011183:Postoperative Complications / Q000209:etiology / Q000601:surgery*; D012008:Recurrence; D012086:Reoperation / Q000379:methods; D012985:Software Design