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Opaque enema
author/s: Dr Dolores Maluenda Colomer

An opaque enema is a radiological technique that enables visualisation of the shape of the colon after introducing a barium contrast through the rectum.

A barium enema is a less effective but useful reasonable alternative if colonoscopy is not available –conventional or virtual- or if the patient cannot be sedated.

Nevertheless, if a polyp is detected, it would not be possible to excise it right away as done in a colonoscopy.