Introduction and classification of inflammatory bowel diseases


Abbreviations

AS

ankylosing spondylitis

CD

Crohn’s disease

EIM

extraintestinal manifestations

GI

gastrointestinal

IBD

inflammatory bowel disease

IBD-V

inflammatory bowel disease variant

IC

indeterminate colitis

PG

pyoderma gangrenosum

TNF

tumor necrosis factor

UC

ulcerative colitis

Introduction

Generally speaking, inflammatory bowel disease (IBD) consists of two classic forms: Crohn’s disease (CD) and ulcerative colitis (UC). CD and UC present with distinctive clinicopathological features. The diagnosis of IBD is made based on a combined assessment of clinical, endoscopic, imaging, and histologic features. Classic CD is characterized by the presence of transmural, granulomatous, skip lesions at any part of gastrointestinal (GI) tract, whereas classic UC is featured with diffuse mucosal inflammation starting from the rectum.

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