Enteroclysis

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Also known as a small bowel enema. A tube is pased either nasally or orally with the tip in the small bowel. Contrast is passed via this tube to distend the small bowel, followed by capture of several still images or sometimes dynamic imaging of the area. As contrast is delivered lower into the bowel, there is less dilution and more of it can reach the distal bowel. It can therefore be more informative than a small bowel follow-through.

Several modalities can be used: traditionally radio-opaque contrast is used in conjunction with fluoroscopy, but tomographic methods such as computed tomography and MRI are increasingly being used as these can also provide information outside the mucosa lining of the bowel, including the bowel wall itself and other intra-abdominal organs.

MRI enteroclysis has the advantage that it involves a much smaller dose of ionising radiation; conventional fluoroscopy is used to guide intubation of the jejunum, whereas magnetic resonance is used for the main procedure. Where magnetic resonance is unsuccessful for whatever reason, conventional fluoroscopy can be used as a fall back.