CT imaging is based on X-rays; accordingly, a risk-benefit assessment regarding radiation exposure is necessary, which is made by the radiologist when determining the indication. If contrast medium administration is necessary, there are additional rare complications:

• An allergic reaction to the contrast medium is rare but possible. These usually manifest themselves as skin reactions, but more severe courses with respiratory distress and circulatory reactions are also possible.
• The contrast medium can also cause short-term nausea and vomiting, but this is usually not an allergic reaction.
• Because the contrast medium contains iodine, there may be increased hormone production if there is pre-existing hyperthyroidism.
• Like many drugs, the contrast medium is excreted via the kidneys, so it can very rarely contribute to further damage to the kidneys in the case of pre-existing kidney damage.

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Therefore, it is important that corresponding pre-existing conditions (known allergy, hyperthyroidism, kidney disease) are communicated in advance, as with appropriate preparation the already low risk of complications can be reduced even further.