The Brazilian butt lift (BBL) got its reputation as one of the riskiest cosmetic operations because of a rare but often fatal complication: fat entering the large veins of the buttock when it's injected into or beneath the gluteal muscle. Since 2018, major plastic surgery societies have urged surgeons to place fat only in the subcutaneous layer, the fat layer above the muscle, and many careful surgeons now confirm the depth of their cannula, sometimes with ultrasound during the operation.
This guide explains the risk in plain language, what safer technique looks like, and the questions to ask any surgeon in Colombia before you book. It's written to help you have a better consultation, not to replace one.
In this guide
Why the BBL got its reputation
A BBL moves your own fat. Liposuction removes it from areas like the abdomen, flanks and back, and after processing it's injected into the buttocks to change their shape and projection. Most of the time it goes as planned. But during the 2010s, plastic surgeons and medical examiners in several countries began to recognize a pattern of deaths during or shortly after the operation, many caused by fat in the bloodstream reaching the heart and lungs.
That pattern prompted unusual action. Plastic surgery societies formed a joint task force, surveyed surgeons about their technique and outcomes, and in 2018 issued what they called an "Urgent Warning" to surgeons performing gluteal fat grafting. The core message was about anatomy: where the fat is placed matters more than anything else.
Published mortality estimates for the BBL have varied over time and between studies, and they've been revised as technique has changed. We don't quote a single figure here because none is current and reliable enough to plan around. The more useful takeaway is that the risk is strongly linked to technique, which is something you can ask about.
Gluteal fat embolism, in plain language
Deep in the buttock, beneath and within the gluteal muscles, run large veins that drain directly toward the heart. If a cannula, the thin metal tube used to inject fat, goes into or below the muscle, it can injure one of those veins. Fat injected nearby can then enter the vein and travel to the heart and lungs. This is called a macroscopic fat embolism, and it can block blood flow suddenly. It often happens on the operating table or soon after, and is very difficult to reverse.
The fat layer above the muscle (the subcutaneous layer) doesn't contain veins of that size. That's why the safety conversation has centered on one question: is the fat going above the muscle, or into it?
Fat embolism isn't the same as a blood clot (DVT or pulmonary embolism), although both can affect the lungs. Clots are a separate risk after many operations, including BBL and liposuction, and are reduced with movement, compression and, for some patients, medication. See flying after a BBL and DVT risk.
What changed: subcutaneous-only grafting
The 2018 task force guidance, issued jointly by U.S. and international plastic surgery organizations, set out practical recommendations. Paraphrasing the main points:
- Inject only into the subcutaneous fat. Avoid injecting into the gluteal muscle or beneath it.
- Use cannula equipment and technique that reduce the chance of going deep. The guidance favored larger, stiffer cannulas, which bend less, and avoiding a downward angle toward the deep vessels.
- Inject only while the cannula is moving, with constant awareness of where the tip is.
- Position the patient so the surgeon has a safe angle of approach.
Since then, many surgeons have also adopted intraoperative ultrasound, scanning during surgery to see the cannula and confirm it's in the subcutaneous layer. Some regulators have also stepped in. In the United States, Florida introduced rules for gluteal fat grafting that include ultrasound guidance. Practices differ between surgeons and countries, so don't assume. Ask.
A safe BBL is defined by where the fat goes, not how much goes in.
One honest trade-off: placing fat only in the subcutaneous layer can limit how much volume is possible in one session, especially in slimmer patients. A surgeon who tells you that your goal may need two stages, or a smaller result, is often being careful, not unambitious. Compare that with realistic expectations by procedure.
The questions to ask your surgeon in Colombia
Bring these to your consultation, virtual or in person, and note the answers. A confident, careful surgeon will answer them directly. You're not being difficult. You're being a good patient.
| Topic | What to ask | What to listen for |
|---|---|---|
| Injection plane | "In which layer do you inject the fat? Do you ever inject into the muscle?" | A clear "subcutaneous only," with no hedging about going deep for extra volume |
| Confirming depth | "How do you confirm where the cannula tip is? Do you use ultrasound during surgery?" | A specific method, whether ultrasound or a described technique, not "experience" |
| Cannula and technique | "What cannula size and type do you use for grafting, and at what angle do you inject?" | Familiarity with the safety guidance and a reason for their choices |
| Who operates | "Will you perform the fat grafting yourself? Who else is in the operating room?" | The surgeon you verified does the grafting; staff roles are explained |
| Operating time | "How long do you expect my operation to take, and what's your limit?" | A realistic estimate and willingness to stop or stage if surgery runs long |
| Combined procedures | "Do you recommend combining my BBL with other procedures? Why or why not?" | Caution about stacking procedures; staging offered when appropriate |
| Anesthesia and facility | "Who gives the anesthesia, and where will I be operated on?" | A licensed anesthesiologist present throughout, at a named facility |
| Emergency plan | "What happens if there's an emergency during or after surgery?" | A clear plan, including hospital transfer if surgery isn't in a hospital |
Swipe to see the full table →
When two surgeons give different answers
If you consult more than one surgeon, and many patients do, compare their answers row by row. It's fine if techniques differ in the details. What should be consistent is a clear commitment to subcutaneous grafting, a specific way of confirming depth, and honesty about how much volume your body allows. If one surgeon promises a much bigger result than the others in a single session, ask them to explain how. A second opinion is worth it when the plans diverge sharply. It also helps to keep written notes of each consultation, so you're comparing what was actually said and not what you remember. Our guide to credentials and consultation notes has a simple format.
On combining procedures: a BBL almost always involves liposuction, and many patients also ask about a tummy tuck or breast surgery in the same session. Longer operations and more procedures can add risk. Read combining cosmetic procedures safely before you agree to an all-in-one plan. On anesthesia, see anesthesia safety in Colombia.
Why "volume" BBL setups are a red flag
Some practices, in Colombia and elsewhere, run high-volume, low-price BBL models: many operations a day, heavy social media marketing, and limited time with the surgeon. The concern isn't the city or the price itself. It's what high volume can push out: unhurried technique, careful depth control, adequate anesthesia staffing and proper follow-up.
Warning signs to take seriously:
- You can't confirm who will actually perform the grafting, or the answer changes.
- The office promises a very large result regardless of how much fat you have.
- Several patients are booked with the same surgeon on the same day, and the office won't say how many.
- Questions about injection plane or ultrasound are brushed off or met with sales talk.
- The price is far below other verified surgeons and the office can't explain why. See the real cost of a BBL.
- You're pushed to pay a deposit quickly, or offered discounts for booking today.
- Anesthesia is described vaguely, or there's no clear plan for emergencies.
A surgeon's following on Instagram is not a credential. Verify training and registration first, using SCCP membership and RETHUS registration. Then ask the safety questions above. Both steps matter.
What you can do to lower your own risk
Technique is the surgeon's job, but some parts of safety are in your hands:
- Verify before you fall in love with a resultCheck credentials before you look at before-and-after photos, and read photos critically. See how to read before-and-after photos.
- Be completely honest in your medical historyDisclose medications, supplements, smoking or vaping, previous surgeries, clotting history and recent weight changes.
- Accept a conservative planIf your surgeon suggests staging, a smaller volume or a shorter operation, ask why. It's usually for your safety.
- Follow the recovery rulesPositioning, compression, walking and follow-up visits all matter. Our recovery timeline gives an overview.
- Plan enough time in ColombiaDon't book a flight home too soon. Ask your surgeon when you're cleared to fly.
If you'd like more context on overall safety in Colombia, our guide Is plastic surgery safe in Colombia? covers the broader picture.
Frequently asked questions
What is a gluteal fat embolism?
It's a rare but very serious complication in which fat injected during a BBL enters large veins deep in the buttock and travels to the heart and lungs, where it can block blood flow. It's strongly associated with injection into or beneath the gluteal muscle, which is why safety guidance says to inject only into the subcutaneous fat layer.
What does "subcutaneous-only" BBL mean?
It means the surgeon places the fat only in the layer of fat between the skin and the gluteal muscle, never into the muscle itself. Major plastic surgery societies have recommended this since their 2018 joint warning. Ask your surgeon to confirm it in plain words.
Do all surgeons use ultrasound during a BBL?
No. Some surgeons use intraoperative ultrasound to see the cannula and confirm it stays above the muscle, and some regulators require it, but practice varies. If your surgeon doesn't use ultrasound, ask how they confirm the depth of the cannula during grafting.
Is a BBL safer in Colombia than in other countries?
Safety depends far more on the individual surgeon, technique, anesthesia and facility than on the country. Colombia has highly trained plastic surgeons and also high-volume, low-price operations. Verify credentials, ask the safety questions in this guide and compare answers.
Can I get a very large BBL result safely in one surgery?
Not always. Keeping fat in the subcutaneous layer limits how much can safely be placed in one session, especially if you're slim. A careful surgeon may suggest a more moderate result or a staged approach. Be wary of anyone who promises a dramatic result regardless of your anatomy.
Considering a BBL in Colombia?
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