Contrast-enhanced Sonography -- New Diagnostic Method for Hepatic Tumors.

The author reflects on the development of ultrasound contrast agents (UCAs) microbubbles, which perform as blood pool tracers, used for ultrasound. She mentions that the UCAs need to be avoided in patients having severe cardiopulmonary disease. She states that rare anaphylactoid reactions have been revealed, manifesting as acute hypotension happening within a few seconds of injection.