An investigation of artefacts in lumbar discography

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Abstract
An artefact of lumbar discography which can confuse or negate delineation of the nucleus pulposus is presented. This artefact is the inadvertent injection of contrast medium into a cavity which is not the true nuclear cavity. A positive diagnosis cannot be made in this situation, mormality can not be proven and, in particular, the presence of a protrusion of the nucleus through the annulus fibrosus may not be demonstrated. Hypotheses are proposed to explain the occurrence of these artefactual injections.

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