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Whole-body MRI for SDHx carriers: what to expect | CION Cancer Clinics
SDHx carriers have MRI scans because their tumours can grow anywhere from the skull base to the pelvis, and many release no hormones a blood test would catch. MRI looks at all of those areas without radiation, which matters when scans repeat for decades. This page explains what the scan finds and misses, what happens on the day, and how it compares with CT. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- Why is whole-body MRI used for SDHx carriers?
- What can the scan find, and what can it miss?
- What happens during a whole-body MRI?
- What do the words on an MRI report mean?
- How does MRI compare with a CT scan for carriers?
- What do carriers get wrong about the scan?
- What this page cannot tell you
- Common questions about whole-body MRI for SDHx
The short answer
Why is whole-body MRI used for SDHx carriers?
Because SDHx tumours can grow anywhere from the base of the skull to the pelvis, and many of them release no hormones a blood test could pick up. An MRI scan can look at all of those places in one visit. It uses no radiation, which matters when scans are repeated for decades, often from childhood.
What it adds to the blood test
The hormone blood test finds tumours that are active. It often misses tumours in the head and neck, which tend to be silent. The scan finds tumours by their shape and size, whether they make hormones or not. The two tests cover each other's blind spots, which is why most plans use both.
Whole-body or several regions
Some centres scan the whole body in one sitting. Others scan the head and neck, chest, abdomen and pelvis as separate regions, sometimes with more detail in each. Both approaches are used in carrier programmes, and the choice often depends on the machine and your team. What matters most is that each repeat scan covers the same areas in the same way, so the radiologist can compare them.
The scan watches for tumours. It does not stop them forming.What the scan looks at
What can the scan find, and what can it miss?
No single test sees everything. Knowing the limits helps you understand why other checks continue alongside it.
Head and neck
Tumours near the carotid artery, the ear and the nerves of the neck. These are common with SDHD and are often found only by scanning, since they rarely release hormones.
Chest, abdomen and pelvis
Tumours along the spine, around the heart, in the adrenal glands and near the bladder. These are the main concern with SDHB, and MRI shows them well. They are also the tumours most likely to release hormones, so the blood test often flags them too.
Kidneys
The scan also shows the kidneys, where a rare SDH-related cancer can grow. A kidney finding is followed up with a dedicated scan. Most kidney spots seen on MRI turn out to be simple, harmless cysts.
What it can miss
Every scan has limits. Your team may add other tests if needed.
- Very small tumours, below what the scan can see
- Small tumours in the stomach wall
- Details that a focused scan of one area shows better
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens during a whole-body MRI?
A safety check first
You are asked about metal in your body, such as a pacemaker, clips or implants. Jewellery, hairpins and phones are left outside the room.
You lie on a padded table
Light frames are placed over parts of the body. The table slides into a tunnel open at both ends. You need to lie very still.
The scan is noisy but painless
The machine makes loud knocking sounds, so you get ear protection. A whole-body scan usually takes about an hour. You can talk to the radiographer at any time.
Contrast dye, sometimes
Some scans use an injection of dye to show certain areas more clearly. Tell the team about kidney problems or past reactions first.
A radiologist reads it
The report goes to your doctor, who compares it with earlier scans and explains what it means for your plan.
On your scan report
What do the words on an MRI report mean?
- Whole-body MRI
- A series of MRI pictures covering the body from head to thighs in one visit. It uses magnets and radio waves, not X-rays.
- Contrast
- A dye given through a vein that makes some tissues stand out. Not every scan needs it.
- Incidental finding
- Something seen on the scan that has nothing to do with SDHx, such as a harmless cyst. Most need no action.
- Indeterminate
- A spot the radiologist cannot yet explain. It usually leads to a repeat or more focused scan, not straight to surgery.
- Sedation
- Medicine that helps a young child stay calm and still during the scan.
- DOTATATE PET-CT
- A different scan that lights up these tumours. It is used to look more closely at a suspected tumour, not for routine checks.
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Side by side
How does MRI compare with a CT scan for carriers?
MRI
CT
No radiation at all
Uses X-rays, which add up with repeat scans
Preferred for routine checks from childhood
Used when a quick or specific answer is needed
Takes longer and is noisier
Takes a few minutes
Not suitable with some metal implants
Works with most implants
Commonly believed
What do carriers get wrong about the scan?
"A clear scan means I can stop the checks."
A clear scan means nothing was seen this time. The fault is still there, so new tumours can appear later. Scans are repeated at the interval your team sets.
"A PET-CT is better, so I should have that every time."
PET-CT is very good at confirming a suspected tumour, but it adds radiation. For routine checks in a well carrier, MRI is usually the right balance.
"The MRI will harm my child."
MRI uses no radiation, which is why it is chosen for children. The main challenge for a child is lying still, which sedation or a patient team can help with.
"If the blood test is normal, the scan is not needed."
Many head and neck tumours release no hormones, so the blood test stays normal. The scan is how they are found.
Being straight with you
What this page cannot tell you
It cannot tell you when your scans should start or how often they should repeat. Many guidelines suggest an MRI every two to three years alongside yearly hormone tests, but the plan depends on your gene, your age and your history. Your team sets it with you.
The evidence is still growing
Whole-body MRI in SDHx carriers has been studied in fairly small groups. It clearly finds tumours early in some people. Experts still debate the best starting age and interval, especially for SDHA and SDHC, where risk is lower.
Who this does not apply to
Most people do not need a whole-body MRI, and it is not a general health check. It is meant for people known to carry an SDHx fault or a similar gene fault. What your specific variant means is a question for the counsellor who ordered the test.
Bring every earlier scan report and disc to each new scan. Comparison is where small changes are spotted.Questions we are asked
Common questions about whole-body MRI for SDHx
How often will I need a whole-body MRI?
Usually every few years, with hormone blood tests in between. The exact gap depends on your gene, your age and whether you have had a tumour before. Your team may bring a scan forward if a blood test or a symptom raises concern.
At what age do children start scans?
It depends on the gene. For SDHB, checks usually begin in childhood. For the other genes, they often start a little later. Your counsellor and paediatric team will suggest a timing that fits your child.
Can I have an MRI if I am scared of closed spaces?
Yes, usually. Tell the team beforehand. You can talk to the radiographer throughout, and some centres have wider machines. A mild sedative can help if needed, but you will then need someone to take you home.
Is the contrast dye safe?
For most people, yes. Serious reactions are rare. Tell the team if you have kidney problems, allergies or a past reaction to dye. Not every scan needs contrast, and some protocols avoid it.
What if the scan finds something?
Most findings are small and harmless. If a spot looks like a tumour, more tests follow, such as a focused MRI, hormone tests or a DOTATATE PET-CT. Decisions about treatment come only after that.
Can I have a whole-body MRI while pregnant?
MRI without contrast dye is generally considered safe in pregnancy, and the dye itself is usually avoided. A routine carrier scan may be moved to after the birth unless there is a concern. Tell the team if you might be pregnant.
Can I get the scan in Hyderabad?
Yes. Several centres in Hyderabad offer MRI protocols for carriers. What matters is that the same kind of scan is repeated, so results can be compared. The helpline can help you arrange it.
Does insurance cover a whole-body MRI?
Cover for scans in a well person varies a great deal. Some policies pay once a doctor documents the medical reason. Check with your insurer in writing before booking, and keep the letter from your genetics team.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- GeneReviews (NCBI) — Hereditary Paraganglioma-Pheochromocytoma Syndromes
- MedlinePlus — MRI Scans
- National Cancer Institute — Pheochromocytoma and Paraganglioma Treatment (PDQ) – Patient Version
- MedlinePlus Genetics — Hereditary paraganglioma-pheochromocytoma
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
Surveillance for SDHx carriersWhere the scan fits in the full check scheduleWhy SDHB carries the highest risk of spreadWhy SDHB carriers are scanned most closelySDHx testing cost in HyderabadWhat tests and scans are likely to costSDHx positive: what happens nextThe first steps after a positive result
Talk to us
Need a scan arranged as part of your SDHx checks?
Tell us which gene you carry and when your last scan was. We will help you book the right scan and the hormone tests that go with it. One helpline serves every CION centre.