Some plastic surgeons in the U.S. do use ultrasound guidance during BBL, and it has become more common in areas where BBL safety has been a major focus. The purpose is to let the surgeon see the cannula position in real time and help keep fat placement above the gluteal muscle, where it is intended to be placed. Ultrasound guidance may improve safety by lowering the chance of fat being placed too deeply into or below the muscle, which is the main concern behind fatal fat embolism. It is still only one part of a safe BBL. Surgeon training, careful patient selection, conservative planning, an accredited facility, an experienced anesthesia team, and strict technique throughout the case all matter. When choosing a surgeon, ask whether they use ultrasound guidance, how they confirm the fat stays in the correct plane, and how often they perform BBLs.