ULTRASOUND IMAGING may detect leaks in silicone breast implants that are not visible by mammography. Sonography may especially be useful for finding silicone that has migrated to lymph nodes, says Kathleen M. Harris, MD, assistant professor of radiology, University of Pittsburgh (Pa) School of Medicine, and medical director, Breast Care Centers, Magee Women's Hospital. In view of the US Food and Drug Administration's (FDA's) moratorium on the use of silicone implants (please see page 787) and the agency's call for more data on their long-term safety, ultrasound imaging may provide some of that badly needed information, says Harris. Speaking at the 77th annual meeting of the Radiological Society of North America held in Chicago, Ill, Harris reported the findings of a study she, Marie A. Ganott, MD, and colleagues at the university have been conducting on women with breast implants who either had palpable lumps or mammograms that suggested leaking