ABSTRACT
Contrast media extravasation occurs occasionally in all radiology practices where radiographic contrast material is injected into the vascular system. They are most frequent during ascending lower extremity venography, where injections are performed on edematous extremities, often while tourniquets are applied. Although the number of contrast media extravasations during Computed tomography has increased substantially over the past few years as dynamic bolus techniques with automated injectors have become widely used, the overall incidence of extravascular injection remains considerably lower than that observed with venography. Extravasation during urography has also been described, although with less frequency, and there are only two recent reports in the literature. Some studies have shown that low-osmolality contrast media are better tolerated than conventional ionic contrast media when extravasated in animals. Significant injuries resulting from extravascular injections of contrast media are fortunately very rare. However, all radiologists must be prepared to follow and treat patients when these complications occur.
