title: Incidence, risk factors, and treatment of dysplasia in the anal transitional zone after ileal pouch-anal anastomosis.
abstract: Preservation of the anal transitional zone (ATZ) after restorative proctocolectomy and stapled ileal pouch-anal anastomosis (IPAA) for ulcerative colitis is controversial.
  
  
  OBJECTIVE
  To evaluate the incidence, risk factors, and treatment options for dysplasia and/or cancer after restorative proctocolectomy and stapled IPAA.
  
  
  METHODS
  We reviewed the records of all 254 patients operated on for ulcerative colitis who had a restorative proctocolectomy, stapled IPAA, and annual postoperative biopsies of ATZ. Follow-up studies included an annual questionnaire and physical examination.
  
  
  RESULTS
  During a follow-up of 2.3 +/- 1.4 (mean +/- standard deviation) years, low-grade dysplasia was found in eight patients (3.1 percent), 16 (median: range, 6-56) months after surgery. Repeated biopsies revealed dysplasia in only two of eight patients, and completion mucosectomy was performed. Dysplasia in ATZ was associated with a preoperative (P = 0.02) or postoperative (P = 0.04) pathologic diagnosis of ulcerative colitis with concurrent dysplasia or cancer. No association (P > 0.05) was found between dysplasia and the following: age, sex, preoperative length of disease, use of a double-stapled versus single-stapled technique, or anastomotic distance from the dentate line.
  
  
  CONCLUSIONS
  Incidence of low-grade dysplasia in ATZ was low. Restorative proctocolectomy with total mucosectomy of the anal canal and handsewn IPAA is recommended for patients with preoperative diagnosis of ulcerative colitis and concurrent cancer or dysplasia. Frequent follow-up with biopsies is recommended for patients with incidental finding of cancer or high-grade dysplasia after restorative proctocolectomy and stapled IPAA with preservation of ATZ. For persistent or recurrent low-grade dysplasia, we recommend a completion mucosectomy.
authors.affiliation: Department of Colorectal Surgery, Cleveland Clinic Foundation, Ohio 44195.
authors.forename: Y
authors.initials: Y
authors.lastname: Ziv
authors.forename: V W
authors.initials: VW
authors.lastname: Fazio
authors.forename: M T
authors.initials: MT
authors.lastname: Sirimarco
authors.forename: I C
authors.initials: IC
authors.lastname: Lavery
authors.forename: J R
authors.initials: JR
authors.lastname: Goldblum
authors.forename: R E
authors.initials: RE
authors.lastname: Petras
mesh_terms: D000328:Adult; D001003:Anal Canal / Q000601:surgery; D000714:Anastomosis, Surgical; D001706:Biopsy; D003093:Colitis, Ulcerative / Q000150:complications* / Q000601:surgery*; D003106:Colon / Q000601:surgery; D003110:Colonic Neoplasms / Q000150:complications* / Q000473:pathology / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011230:Precancerous Conditions / Q000150:complications* / Q000473:pathology / Q000601:surgery; D016737:Proctocolectomy, Restorative; D012189:Retrospective Studies; D012307:Risk Factors