The American Society of Plastic Surgeons says the Brazilian butt lift is the most dangerous form of plastic surgery.
The organization says one in 3,000 patients die as a result from having the surgery.
Many people undergo the butt lift to get a more shapely figure like Kim Kardashian or Nicki Minaj.
The surgery combines liposuction with fat grafting.
Plastic surgeon Urmen Desai, M.D., explains what can go wrong.
"Some surgeons are injecting a little too deep. There are some important veins that bring blood from the lower aspect of the legs back into the heart, into the lungs," he said.
Surgeons' group: Brazilian butt lift most dangerous surgery procedure