The invention relates to an emulsion for use as an X-ray contrast agent and containing one or more iodinated lipids emulsified in an aqueous phase. The emulsion contains one or more amino acids, fatty acids or their salts, fat-soluble vitamins and/or urea for increasing its stability. Furthermore, the emulsion may contain one or more pharmacologically acceptable oils or fats. By the stability-increasing agents, it has been possible to prepare emulsions of iodinated lipids which can be sterilized in an autoclave and be stored for a long time without the emulsion breaking.
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