title: Review article: Indeterminate colitis--definition, diagnosis and management.
abstract: BACKGROUND
  The term indeterminate colitis is imprecise and without a generally accepted definition. Nevertheless, it is a term that is commonly used by gastroenterologists, pathologists and surgeons.
  
  
  OBJECTIVE
  To offer an opinion supported by published data, about the appropriate use of the term indeterminate colitis by addressing a series of questions.
  
  
  METHODS
  A PubMed database search was performed using the keywords, 'colitis' and 'inflammatory bowel disease' each combined individually with the following adjectives: 'indeterminate', 'unclassified', 'undefined', 'undiagnosed' and 'non-specific'.
  
  
  RESULTS
  There is no generally accepted definition of indeterminate colitis. All current applications of the term rely on exclusionary criteria and there is no confirmatory diagnostic test. Nevertheless, the diagnosis of indeterminate colitis appears to be durable in a subgroup of patients, suggesting that this group represents a unique phenotype.
  
  
  CONCLUSIONS
  Indeterminate colitis has expanded from a strictly defined, postcolectomy pathological diagnosis to become, in addition, a clinical diagnosis without generally accepted criteria. A diagnosis of indeterminate colitis should be qualified with descriptors for the diagnostic criteria applied.
authors.affiliation: Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA. tremaine.william@mayo.edu
authors.forename: W J
authors.initials: WJ
authors.lastname: Tremaine
mesh_terms: D000714:Anastomosis, Surgical; D003092:Colitis / Q000175:diagnosis* / Q000628:therapy; D003937:Diagnosis, Differential; D006801:Humans; D016737:Proctocolectomy, Restorative; D012017:Referral and Consultation