Detection of breast cancer with addition of annual screening ultrasound or a single screening MRI to mammography in women with elevated breast cancer risk. JAMA, 2012, Vol. 307(13), p.1394-1404.
Berg, W.A., et al.
http://jama.ama-assn.org/content/307/13/1394.short?rss=1
Annual ultrasound screening may detect small, node-negative breast cancers that are not seen on mammography. Magnetic resonance imaging (MRI) may reveal additional breast cancers missed by both mammography and ultrasound screening.