Hello, you have great question --can you see silicone injections in the buttocks on ultrasound. The answer is "YES". Usually, the best way to see silicone, PMMA, biopolymers, and other foreign bodies in the buttocks is with a MRI. However, if a MRI is unavailable, an ultrasound may be the next best imaging tool. A significant portion of my practice is devoted to silicone removal throughout the entire body. One difficulty I have had is that freely injected silicone moves. So when a patient gets an ultrasound or an MRI several months before surgery, that does not mean that the silicone stays in that location. I have had many patients where the silicone has moved. I have had multiple patients where the silicone has moved approximately 24 inches in just three months! Therefore, I have developed my own technique where I use an ultrasound during surgery to localize the silicone. I have multiple videos on RealSelf, YouTube and my website showing the silicone on ultrasound. To me, on ultrasound, the silicone looks like church bells. Please see my video. If you have any further questions regarding silicone removal from the buttock, please contact my office. When seeking a plastic surgeon, please seek an expert who has treated hundreds of patients with silicone in their buttocks. Thanks for your great question regarding silicone visualization with ultrasound. Sincerely, Dr. Katzen.