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Each year, more than five millioncosmetic filler proceduresare performed in the U.S.— but these injectables can potentially block key blood vessels, putting patients at risk for serious harm.
In a study presented this week at the annual meeting of the Radiological Society of North America (RSNA) in Chicago, doctors found that ultrasound technology can spot these dangerous blockages early enough to guide treatment and help prevent lasting injury.
The researchers looked at data from 100 patients from six different locations who experiencedvascular complicationsafter hyaluronic acid filler injections.All data were collected between May 2022 and April 2025, according to a press release.
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They found that ultrasounds successfully detectedvascular occlusion, which is a blockage in a blood vessel that stops normal blood flow.
If this condition goes untreated, it can cause pain, skin damage and scarring — and, in severe cases, vision loss or stroke.

Each year, more than five million cosmetic filler procedures are performed in the U.S.— but these injectables can potentially block key blood vessels.(iStock)
“Doppler ultrasound helps doctors see exactly where the filler is, how the blood is flowing in real time, and whether blood vessels may have been affected after acosmetic procedure,” lead researcher Rosa Maria Silveira Sigrist, M.D.
“The physical exam continues to be very important, but the ultrasound adds extra information that makes the evaluation safer and the treatment more precise.”
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In the study, more than 40% of patients had blockages in the perforator vessels, which are small connecting blood vessels, while 35% had major facial arteries that showed no blood flow.
Thenasal regionwas identified as the highest-risk area, as the lateral nasal artery runs along the side of the nose and supplies blood to larger arteries that lead toward the eye and the brain.

Doctors found that ultrasound technology can spot dangerous blockages early enough to guide treatment and help prevent lasting injury.(iStock)
“Vascular occlusion after filler injections can lead to devastating outcomes, including skin necrosis, tissue loss, and — in the worst cases — blindness andeven stroke,” Dr.
“Once a critical artery — for example, one feeding the retina or skin — is occluded by filler or embolus, the damage may be irreversible.”
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In the hands of an experienced, licensed professional using proper techniques, the risk of a vascular occlusion should be less than 1%, according to Dr.Samuel Golpanian, a double board-certified plastic surgeon in Beverly Hills.
“But if fillers are done by someone untrained or using the wrong needles or methods, the complication rate can be much higher — 10% to 20%, which is completely unacceptable,�

In the hands of an experienced, licensed professional using proper techniques, the risk of a vascular occlusion should be less than 1%, one plastic surgeon stated.(iStock)
To minimize dangerous complications, Pirano — another outside expert not involved in the study — emphasized that injectable treatments should be performed by board-certified specialists with formal training in facial anatomy and complication protocols.
Study limitations
Some limitations of the study were noted, including its relatively small sample size (100 adults) and the fact that it has not yetbeen peer-reviewed.
experienced specialists,�“This shows how important it is to create clear, standardized guidelines, so the exam can be done in a more consistent way.”
“Once a critical artery is occluded by filler or embolus, the damage may be irreversible.”
Also, all study participants experienced significant complications, which means the findings may not apply to those with milder cases or different filler types.
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There could also be some degree of geographic bias, as the research was conducted in Brazil, where training standards may differ from the U.S.
Future studies are needed to follow more patients over longer time periods and track their recovery after ultrasound-guided treatment, the study noted.
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