Abstract
The majority of patients with chronic inflammatory bowel disease (IBD) are diagnosed with either ulcerative colitis (UC) or Crohn’s disease (CD) on the basis of established clinical, endoscopic, histologic, and radiologic criteria. However, in 5–23 % of patients with chronic colitis, a definitive diagnosis of UC or CD cannot be established because the initial macroscopic appearance (either during ileocolonoscopy or following colectomy) and histologic features overlap between UC and CD. While most of these patients eventually evolve into patterns consistent with UC or CD, approximately 20–60 % retain the diagnosis of indeterminate colitis (IC) over periods as long as 5–10 years post diagnosis. This latter observation suggests that IC may constitute a separate category within the spectrum of IBD. This chapter reviews the histologic and clinical features of IC in pediatric patients and contains updated information explaining why some patients continue to be diagnosed with IC (new proposed terminology of IBD-unclassified (IBD-U).For the present, IC and IBD-U refer to chronic colitis due to idiopathic IBD for which the features of CD and UC are absent. It has been suggested that the term IC should be the preferred term after histologic evaluation of the resected colon and IBD-U used after review of biopsy specimens.
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Kirschner, B. (2016). Indeterminate Colitis/Inflammatory Bowel Disease Unclassified (IBD-U). In: Guandalini, S., Dhawan, A., Branski, D. (eds) Textbook of Pediatric Gastroenterology, Hepatology and Nutrition. Springer, Cham. https://doi.org/10.1007/978-3-319-17169-2_29
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DOI: https://doi.org/10.1007/978-3-319-17169-2_29
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