Neck artery calcium seen on a dental X-ray

What the report means

Where it shows. The spots usually sit in the soft tissue of the neck next to the third and fourth neck bones, about 1.5 to 2.5 cm below and behind the angle of the jaw, where the carotid artery splits. (Janiszewska-Olszowska 2022)
What it may be. Plaque in the carotid arteries is made of fat, cholesterol, calcium and other substances, and narrowing there can lead to a stroke. (MedlinePlus)
Look-alikes. Parts of the voice box (triticeous and thyroid cartilage), the hyoid bone, a calcified stylohyoid ligament, the epiglottis, salivary or tonsil stones, small calcified veins and calcified lymph nodes can look similar, so the finding is a possible sign, not a diagnosis. (Janiszewska-Olszowska 2022)
A dental X-ray does not measure narrowing. Calcium shows that plaque may be there, but not how much it narrows the artery. Some narrowed arteries contain calcium and others do not. (Johansson 2011)

How often it matches real narrowing

How common the finding is. Reported rates vary widely. A Swedish study cites 3.5% to 4.2% of people having panoramic X-rays; an Australian study found 10.8% of 5,780 X-rays; a Polish study of patients aged 45 to 87 found 21.7% (14.9% on one side, 6.4% on both). (Johansson 2011)(CACO study 2019)(Janiszewska-Olszowska 2022)
Swedish study. Of 117 people with the finding who had a neck ultrasound, 8 (6.8%) had 50% to 99% narrowing. All were men: 12.5% of the men had narrowing and none of the women. (Johansson 2011)
Australian study. 15.4% of people with the finding had narrowing of 50% or more on ultrasound, compared with 5.8% of age- and sex-matched people without it: about 1 in 7 against 1 in 20. (CACO study 2019)
Stroke risk. A 2007 systematic review found only 1 of 54 studies met its quality criteria and called the evidence linking the finding to stroke incomplete and inconclusive. (Mupparapu 2007)

What usually comes next

Share the report with your doctor. The Australian authors said the finding needs both reporting by the radiologist and clinical follow-up. (CACO study 2019)
A neck ultrasound if your doctor advises it. A Doppler ultrasound is generally regarded as the standard test to confirm or rule out narrowing. (Janiszewska-Olszowska 2022) The Swedish authors suggested follow-up ultrasound for men with the finding, since all the narrowings they found were in men. (Johansson 2011)
Why ultrasound is not for everyone. The USPSTF found that when the general population is screened, where only 0.5% to 1% have narrowing, ultrasound gives many false-positive results. (USPSTF 2021) See carotid artery screening for how the test works.

How it ties to your age-based checks

The USPSTF lists older age, male sex, high blood pressure, smoking, high cholesterol, diabetes and heart disease as factors that raise the risk of carotid narrowing. (USPSTF 2021) A calcium finding is a reason to make sure your routine checks are up to date:

Calcium found by chance elsewhere is covered on aortic calcification seen on an X-ray or CT, heart artery calcium found by chance on chest CT and breast artery calcium on a mammogram.

Who it applies to

Adults without stroke symptoms told that a panoramic dental X-ray shows calcium in the area of the carotid arteries. The Polish study covered patients aged 45 to 87, with an average age of 62. (Janiszewska-Olszowska 2022) People who have had a stroke or a transient ischemic attack (TIA) are not covered by the USPSTF screening advice. (USPSTF 2021)

NHS, check for signs of a stroke: (NHS)

face weakness: one side of your face may droop (fall) and it might be hard to smile
arm weakness: you may not be able to fully lift both arms and keep them there because of weakness or numbness in 1 arm
speech problems: you may slur your words or sound confused

The NHS says to call 999 (911 in the US) and to get medical help straight away even if the symptoms stop. (NHS)

Routine age-based screening

A finding on a dental X-ray does not replace the routine screenings for your age. See screenings by age and gender.

Where they differ:

Screening without symptoms. The USPSTF recommends against carotid screening in the general adult population (grade D), and notes the American Heart Association and American Stroke Association also recommend against routine screening. The Society for Vascular Surgery and joint US society guidelines suggest considering ultrasound in people with several stroke risk factors or known artery disease. (USPSTF 2021)
Who should have an ultrasound after the finding. The Swedish study found narrowing only in men and suggested follow-up for men. (Johansson 2011) The Australian study suggested clinical follow-up for everyone with the finding. (CACO study 2019)
Link to stroke. The Polish authors see panoramic X-rays as a useful way to spot people at higher stroke risk. (Janiszewska-Olszowska 2022) A systematic review called that link unproven. (Mupparapu 2007)

Your doctor decides what your result means for you.

Questions people ask

Does calcium on my dental X-ray mean my neck artery is blocked?

Not usually. In a Swedish study of people with this finding who had a neck ultrasound, 6.8% had 50% to 99% narrowing. In an Australian study the figure was 15.4%, about 1 in 7, compared with 1 in 20 in people without the finding. (Johansson 2011) (CACO study 2019)

Could it be something other than an artery?

Yes. Parts of the voice box, the hyoid bone, a hardened ligament, salivary or tonsil stones and calcified lymph nodes can look similar on a panoramic X-ray. (Janiszewska-Olszowska 2022)

Which test checks the neck arteries?

A Doppler ultrasound of the neck is the usual test to confirm or rule out narrowing. Whether you need one is up to your doctor. (Janiszewska-Olszowska 2022) (USPSTF 2021)

Is neck artery screening recommended for everyone?

No. The USPSTF recommends against screening adults without symptoms (grade D). Some US specialist societies suggest considering an ultrasound in people with several stroke risk factors or known artery disease. (USPSTF 2021)

What symptoms need help right away?

The NHS says face drooping, arm weakness or speech problems that start suddenly are signs of a stroke: call 999 (911 in the US). Get help even if the symptoms stop. (NHS)