title: Colonic perforation in collagenous colitis: a systematic review of a rare complication and guidance on management.
abstract: OBJECTIVE
  Collagenous colitis is an increasingly diagnosed clinical and pathological variant of microscopic colitis, mainly affecting middle-aged and elderly women; herein we review the literature for a rare complication (colonic perforation) and the most appropriate management.
  
  
  METHODS
  EMBASE, MEDLINE and abstracts from major gastroenterological congresses were searched in addition to hand-searching of electronic journals. Ten case reports and short series were identified as relevant to this study, and full papers of all these articles were obtained.
  
  
  RESULTS
  A total of 30 cases were recorded (28 female; age range 37-86 years, median 66 years). Colonic perforation was reported in 21 cases, mainly following colonoscopy (15 cases) or barium enema (4 cases). The site of colonic perforation/tears was predominantly right sided (17 cases). These cases were managed differently in different series, and none of the collagenous colitis-related colonic perforations that were treated conservatively (n = 5), or with diagnostic laparotomy but no colonic resection (n = 2), required further surgical intervention.
  
  
  CONCLUSIONS
  Conservative management of collagenous colitis-related perforation seems to be an appropriate initial approach. However, diagnosis of collagenous colitis is usually retrospective in colonic perforations related to endoscopy or barium enema, i.e. when the histology results are available, and it seems difficult to provide a management plan specific to these patients in the clinical setting. Therefore general guidelines for management of all colonoscopy- and barium enema-related perforation are required. When perforation occurs in an otherwise intact colon, diagnostic laparoscopy can be considered as appropriate initial management.
authors.affiliation: York Hospitals NHS Foundation Trust, York, UK.
authors.forename: Z
authors.initials: Z
authors.lastname: Hussain
authors.forename: S
authors.initials: S
authors.lastname: Kelly
authors.forename: A
authors.initials: A
authors.lastname: Clarke
authors.forename: S
authors.initials: S
authors.lastname: Adams
authors.forename: G
authors.initials: G
authors.lastname: Miller
mesh_terms: D046729:Colitis, Collagenous / Q000150:complications*; D003108:Colonic Diseases / Q000209:etiology*; D006801:Humans; D007416:Intestinal Perforation / Q000209:etiology*
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