title: Adenocarcinoma of the ileoanal pouch anastomosis: an emerging complication?
abstract: OBJECTIVE
  Restorative proctocolectomy with ileoanal pouch anastomosis (IPAA) is currently the surgical treatment of choice for ulcerative colitis. Although dysplastic changes to the native ileal mucosa of the pouch occur in a subgroup of patients with severe chronic pouchitis, the development of cancer in the pouch itself is a very rare event. To date, only two cases of carcinoma of the IPAA have been reported, namely in patients operated on for colon cancer complicating ulcerative colitis and with a previous diagnosis of backwash ileitis.
  
  
  METHODS
  We report a patient with carcinoma in an ileoanal pouch who had been suffering from chronic atrophic pouchitis early after surgery. He had no previous history of colon cancer or backwash ileitis. The adenocarcinoma was detected 22 months after IPAA, and it was deeply infiltrating the adjacent structures (pT4N0M0, grade 2). Histology revealed the passage from chronic atrophic pouchitis to dysplastic epithelium and to cancer.
  
  
  CONCLUSIONS
  Our case suggests that malignant transformation of the IPAA may occur as a pure complication of the severe chronic pouchitis, even in the absence of backwash ileitis or a previous history of colon cancer.
authors.affiliation: Department of Gastroenterology, Nuovo Regina Margherita Hospital, Via E. Morosini 30, 00153 Rome, Italy.
authors.forename: Cesare
authors.initials: C
authors.lastname: Hassan
authors.forename: Angelo
authors.initials: A
authors.lastname: Zullo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Speziale
authors.forename: Francesca
authors.initials: F
authors.lastname: Stella
authors.forename: Roberto
authors.initials: R
authors.lastname: Lorenzetti
authors.forename: Sergio
authors.initials: S
authors.lastname: Morini
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis*; D000328:Adult; D000714:Anastomosis, Surgical / Q000009:adverse effects*; D003093:Colitis, Ulcerative / Q000601:surgery; D006801:Humans; D007078:Ileal Neoplasms / Q000175:diagnosis*; D007413:Intestinal Mucosa; D008297:Male; D016737:Proctocolectomy, Restorative / Q000009:adverse effects*