Figure 5: Water as an artefact. The image represents an attempt to perform a lateral chest X-ray on a quadriplegic on a waterbed to avoid bedsores. The inferiorly-located (below red line), greyish homogenous opacity represents the water bags. It is almost iso-dense with the diaphragm located superior to it. This water artefact could be a source of confusion to the reporting radiologist oblivious of its origin