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Scans that find the overactive gland before parathyroid surgery | CION Cancer Clinics
Before parathyroid surgery, scans such as a neck ultrasound and a sestamibi scan find which gland is overactive and where it sits. They help the surgeon plan the operation. They do not diagnose the condition, which comes from blood tests, and a negative scan does not rule surgery out. This page explains each scan, what happens on the day and the words on your report. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- Why do I need scans before parathyroid surgery?
- Which scans might you be offered?
- What happens at a sestamibi scan appointment?
- What do the words on a scan report mean?
- What do people often believe about these scans?
- What if the scans disagree, and what can this page not tell you?
- Common questions about parathyroid scans
The short answer
Why do I need scans before parathyroid surgery?
Scans are done to find which parathyroid gland is overactive and where it sits, so the surgeon can plan the operation. They do not decide whether you have hyperparathyroidism. That diagnosis comes from your blood tests, and scans are arranged once surgery is being considered.
What the surgeon gains from them
If two scans point clearly to the same gland, the surgeon may be able to go straight to it through a smaller cut. If the scans disagree or show nothing, the surgeon plans to look at all four glands. Either way, the scans shape how the operation is done, not whether you need one.
Why a sestamibi scan is so common
Sestamibi is a small amount of a radioactive tracer. Overactive parathyroid tissue holds on to it longer than the thyroid does. Pictures taken soon after the injection and again later show the gland that is still holding the tracer. It is often paired with a neck ultrasound.
Who may need fewer scans, or different ones
If your team already plans to look at all four glands, for example with an inherited condition, extra scans may add little. If you have had neck surgery before, more detailed scans are usually needed. Pregnancy and breastfeeding change which scans are safe, so tell the team early.
Your options
Which scans might you be offered?
Most people have two. Which ones depends on what your centre offers and what the first scan showed. Ask your team which they are requesting, and why.
Neck ultrasound
A probe on the neck uses sound waves to look for an enlarged gland. There is no radiation, and it also checks the thyroid, which matters if both need attention.
Good to know
- Depends a lot on the person scanning
- Can miss glands low in the neck or in the chest
Sestamibi with SPECT-CT
The tracer scan described above. SPECT-CT combines the tracer pictures with a CT scan in three dimensions, so the surgeon sees exactly where the gland lies.
You lie still under a camera for each set of pictures.4D-CT
A CT scan of the neck taken at several moments after a contrast dye injection. Overactive glands take up and release the dye in a typical pattern. It is useful when other scans are unclear.
Choline PET-CT
A newer scan using a tracer that overactive parathyroid tissue takes up. Fewer centres offer it. Ask whether it is available where you are treated, and whether your scheme or insurer covers it.
MRI
Used less often, for example when radiation should be avoided or when other scans have not found the gland.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens at a sestamibi scan appointment?
Preparation
Most people eat normally. Tell the team about thyroid tablets, any recent CT scan with dye, pregnancy or breastfeeding, because these can affect the scan or its safety. Follow the centre's own preparation sheet.
The injection
A small amount of tracer goes into a vein in your arm. It feels like a blood test. It is not a dye, and it does not cause a warm flush or a strange taste.
The early pictures
You lie on a couch with a camera close to your neck and chest, and keep still. It is not a closed tunnel, so people who find an MRI difficult usually manage it.
The wait and the later pictures
You wait, then have a second set of pictures, sometimes with a SPECT-CT. The gap is long, so bring water, something to read and a family member if you like.
On your report
What do the words on a scan report mean?
- Localised
- The scan has pointed to a specific gland or position.
- Concordant
- Two different scans agree on the same gland. This is what makes a focused operation possible.
- Discordant
- The scans point to different places. The surgeon will usually plan to check more than one gland.
- Negative scan
- No overactive gland was seen. It does not mean you do not have hyperparathyroidism.
- Ectopic gland
- A gland sitting away from its usual place, such as low in the neck or inside the chest.
- Multigland disease
- More than one gland is overactive. Scans often show fewer glands than are really involved.
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Did you know
Parathyroid glands do not always sit where textbook drawings show them. A gland can lie beside the voice box, low in the neck or inside the upper chest. This is one reason a single scan is sometimes not enough, and why a surgeon plans for the unexpected.
Commonly believed
What do people often believe about these scans?
"My scan was negative, so I do not need surgery."
A negative scan means the gland was not seen. It does not mean the gland is normal. The diagnosis rests on your blood tests, and surgery can still be considered, with the surgeon looking at all four glands.
"The radiation from the scan is dangerous."
The amount of tracer is small, and most of it leaves the body quickly. Your team weighs this against the benefit of a well-planned operation. Tell them if you are pregnant or breastfeeding, because the advice changes.
"The scan will tell us whether it is cancer."
Scans show where a gland is and how large it is. They cannot reliably tell a benign adenoma from a cancer. That answer comes from the removed tissue under a microscope.
"More scans always make the operation safer."
Once two clear scans agree, extra ones rarely change the plan. They add cost, time and radiation. Ask your team what a further scan would change before agreeing to it.
Being straight with you
What if the scans disagree, and what can this page not tell you?
When scans disagree or show nothing, the surgeon usually plans to explore the neck and look at all four glands. That is a standard, well-established approach. It needs a slightly longer cut and more time in theatre.
Questions to ask your centre
Ask which scans they rely on, who reads them, and whether the surgeon looks at the pictures personally. Ask whether SPECT-CT, 4D-CT or choline PET-CT are available, and what each would change in your case. Ask what happens if the gland is not where the scans suggested.
Bringing scans from elsewhere
If you had scans in another city or district, bring the actual images on a disc or a download link, as well as the written report. A surgeon often wants to see the pictures, and repeating a scan you did not need costs money and time.
What this page cannot tell you
It cannot tell you which scans you need, whether your report is right, or what operation you will have. Your surgeon puts the scans together with your blood tests and history. Take your questions to that appointment.
If your calcium symptoms worsen while you wait for a scan, such as confusion or repeated vomiting, seek same-day care.Questions we are asked
Common questions about parathyroid scans
Do I need to stop eating before a sestamibi scan?
Usually not. Most centres let you eat and drink normally. Some ask about thyroid medicines or supplements containing iodine beforehand, and they will tell you if anything needs to change. Follow the preparation sheet from the centre where you are booked, and call them if anything is unclear.
How long does the whole scan take?
Plan for most of a morning or an afternoon. There is an early set of pictures, a waiting period and a later set, and SPECT-CT adds a little more time. The centre will give you arrival and return times. Bring water, any food you are allowed and something to pass the time.
Is it safe to be around children afterwards?
The tracer amount is small and much of it leaves the body within the day. Many centres suggest avoiding long, close contact with babies and pregnant women for the rest of that day as a precaution. Follow the specific advice the centre gives, especially if you are breastfeeding.
Why do I need two different scans?
Each scan has blind spots. Ultrasound sees the neck well but struggles low down or in the chest. Sestamibi can miss small glands. When two scans agree, the surgeon can be more confident about where to go. When they disagree, it tells the surgeon to plan a wider look.
My ultrasound also found a thyroid nodule. What now?
This is common. Thyroid nodules are often found alongside parathyroid disease. Your team may suggest a needle test of the nodule before surgery, or deal with it in the same operation if needed. Ask whether the nodule changes the plan, so both problems are handled together.
Can I have a CT with dye if I have kidney problems or diabetes?
Tell the team about any kidney disease, diabetes medicines such as metformin, or a past reaction to dye. They may check kidney function first, choose a different scan or give extra fluids. Do not stop metformin or any other medicine on your own. The team will tell you what to do.
What happens if all my scans are negative?
The diagnosis does not change, because it comes from your blood tests. Your surgeon may request another type of scan, or plan to look at all four glands during surgery. A negative result changes how the operation is planned, and your surgeon will explain what that means for you.
Are these scans covered by Aarogyasri or insurance?
Often, when they are part of an approved plan for parathyroid surgery. Cover varies between Aarogyasri, CGHS, ECHS, EHS and cashless insurers, and newer scans may not be included everywhere. Call the helpline with your scheme details before booking, and the team will help you check.
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Sources
- NHS — Hyperparathyroidism
- NICE — Hyperparathyroidism (primary): diagnosis, assessment and initial management (NG132)
- National Cancer Institute — Parathyroid Cancer Treatment (PDQ) - Patient Version
- Cancer.Net — Parathyroid Cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
ParathyroidectomyThe full guide to parathyroid surgeryMinimally Invasive ParathyroidectomyThe focused operation that agreeing scans make possibleParathyroidectomy: What the Operation InvolvesThe operation from tests to going homeHigh Calcium: Why It Needs TreatingWhy the blood tests come before the scansFitness, Tests and PrehabilitationThe other checks before an operation
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