[Iatrogenic complications from contrast materials].

Iodinated or gadolinium-based contrast agents are usually well tolerated, but some adverse events can happen due to a direct toxicity of the injected molecule (contrast-induced nephropathy, abnormal thyroid function), or to an indirect effect like in true allergic reactions. Radiologists must be familiar with the possibility of adverse events from contrast agents or injection procedures, and should be able to treat the patient. Also, they should take all necessary actions to minimize the occurrence of possible reactions in the presence of risk factors.