Published online by Cambridge University Press: 06 June 2020
The small intestine has three structural parts: duodenum, jejunum and ileum. The jejunum and ileum are about 2.5 m long and 3 m long respectively in adults and form the majority of the small intestine, which has a total mucosal surface area of approximately 30 square metres. The small intestine was long regarded as a place where little happens, essentially because visualisation was imprecise or inaccurate. With the development of flexible endoscopy, it was possible first to reach the ileum because of ileocolonoscopy, and later to reach the jejunum because of enteroscopy. As a result of these developments, biopsies from the ileum and jejunum are now part of routine histopathological practice. The pathology may include neoplastic and inflammatory diseases. This chapter on jejunitis and ileitis focuses mainly on the inflammatory conditions. These can be limited to the small intestine, jejunum, and/or terminal ileum, or may also involve the upper gastrointestinal tract and/or colon and rectum. The text includes a description of both acute, usually infectious, diseases, and chronic inflammatory diseases. There are many chronic diseases, affecting in particular the terminal ileum. Clinically, Crohn’s disease is often a consideration. Drug-induced lesions, infections, endometriosis, ulcerative colitis, lymphoma, and lymphoid hyperplasia can mimic Crohn’s disease of the terminal ileum. Biopsies can help to solve the differential diagnosis and orient the clinical team towards proper management of the patient.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.