What actually is an MRI, and is it safe?

An MRI, magnetic resonance imaging, uses magnetic fields and radio waves to build detailed images of the brain's structure. Unlike a CT scan, it involves no radiation at all, which is part of why it's the preferred imaging tool for children specifically. No metal can be brought into the scanning room, which staff will check for beforehand.

Why does an MRI matter so much for understanding cerebral palsy?

It helps identify exactly where and how the brain was affected, which in turn helps explain why a specific child has the particular pattern of movement difficulty they have. It can also help rule in or rule out other conditions that sometimes get confused with CP early on, making it a genuinely useful diagnostic and explanatory tool, not just a formality.

What should parents actually expect during the scan itself?

The machine is genuinely loud, with distinct banging and clicking sounds, which can startle a child who hasn't been warned about it beforehand. Because a child needs to stay completely still for accurate images, and the scan itself often takes 30 to 60 minutes or longer, sedation or general anaesthesia is commonly used for younger children, which usually means following fasting instructions beforehand and arranging quiet recovery time afterward.

What is MRICS, and what are the main categories of findings?

MRICS, the MRI Classification System, was developed to standardise how brain MRI findings in CP are categorised, sorting results into five groups: white matter injury, grey matter injury, brain maldevelopments, miscellaneous findings, and normal findings. White matter injury is consistently the most common pattern found across large studies, often in the range of 45 to 65% of cases.

What Is a Brain MRI and What Does It Show in Cerebral Palsy?

Causes & Prevention 11 min read

What Is a Brain MRI and What Does It Show in Cerebral Palsy?

Q: Does a normal MRI mean my child doesn't actually have cerebral palsy?

No, and this deserves clear, direct reassurance. Multiple studies have found that roughly 9 to 16% of children with a confirmed clinical diagnosis of cerebral palsy have a completely normal brain MRI. A normal scan doesn't mean the diagnosis is wrong; it simply means the specific mechanism isn't visible on structural imaging in that particular case, which is a genuinely different thing from the diagnosis itself being incorrect.

Q: Do specific MRI findings predict how severe a child's cerebral palsy will be?

There are meaningful general tendencies, though not certainties for any individual child. White matter injury has been associated with somewhat better motor outcomes and lower rates of intellectual disability compared with other patterns. Grey matter injury and brain maldevelopments have been more associated with epilepsy, hearing loss, and more significant overall impairment. These are population-level patterns worth knowing, not individual predictions.

A referral letter, an appointment date, and not much else. That’s how a lot of families end up at their child’s first brain MRI: with a scan booked and almost nothing explained. Here’s what actually happens, and what those results genuinely mean once they come back.

Written by CP Clinic Medical Team Tovmed Medical Center, Vinnytsia, Ukraine

Medically reviewed by Prof. Vigein Tovmasian PhD · Orthopedic Surgeon · Honorary Doctor of Ukraine

What an MRI actually is

An MRI, magnetic resonance imaging, uses magnetic fields and radio waves to build detailed images of the brain’s structure. Unlike a CT scan, it involves no radiation at all, which is a big part of why it’s the preferred imaging tool for children specifically. No metal can go into the scanning room, something staff check for carefully beforehand.

Why it matters so much for cerebral palsy

An MRI helps identify exactly where and how the brain was affected, which in turn helps explain why your own child has the particular pattern of movement difficulty they have, a question covered in full depth in our guide to what happens in the brain. It can also help confirm or rule out other conditions sometimes confused with CP early on, making it a genuinely useful diagnostic tool, not just a routine box to tick.

What to actually expect during the scan

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It’s genuinely loud Distinct banging and clicking sounds throughout, which can startle a child who wasn’t warned beforehand. Preparing them for the noise in advance genuinely helps.
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It takes real time A detailed brain MRI often runs 30 to 60 minutes or longer, during which a child needs to stay completely still for accurate images.
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Sedation or general anaesthesia is commonly used Since staying still that long often isn’t realistic for younger children. This usually means following specific fasting instructions beforehand and arranging quiet recovery time afterward.
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No metal in the room Jewellery, certain clips, and similar items need to come off beforehand; staff will guide you through this directly.

Understanding the results: MRICS

Results are commonly organised using the MRI Classification System, or MRICS, developed to standardise how these findings get categorised across hospitals and countries. It sorts results into five groups, in a similar spirit to how GMFCS standardises functional levels.

45–65%

White matter injury

Consistently the most common pattern across large studies, often linked to prematurity.

10–20%

Grey matter injury

Damage to the brain’s outer or deeper grey matter regions rather than the connecting white matter.

10–15%

Maldevelopments

Differences in how the brain structurally developed, rather than injury to an otherwise typically forming brain.

Variable

Miscellaneous findings

Patterns that don’t fit neatly into the other categories, still meaningful, just less common as a group.

9–16%

Normal findings

No visible structural abnormality at all, covered in full below since it’s so often misunderstood.

Why a normal MRI doesn’t mean a wrong diagnosis

Worth stating plainly and directly

Multiple studies have found that roughly 9 to 16% of children with a confirmed clinical diagnosis of cerebral palsy have a completely normal brain MRI. A normal scan doesn’t mean the diagnosis is wrong. It simply means the specific mechanism isn’t visible on structural imaging in that particular case, which is a genuinely different thing from the diagnosis itself being incorrect.

If this describes your own child’s results, and there are additional reasons to wonder about the diagnosis, such as a family history of similar symptoms or unexplained regression, our guide on CP versus other neurological conditions covers exactly when further testing might genuinely be worth raising.

What different findings tend to mean

These are meaningful general tendencies across large groups of children, not certainties for any individual child. White matter injury has been associated with somewhat better motor outcomes and lower rates of intellectual disability compared with other patterns. Grey matter injury and brain maldevelopments have been more associated with epilepsy, hearing loss, and more significant overall impairment.

A genuinely hopeful, evidence-based point

Research has found that starting rehabilitation earlier improves outcomes across every single MRICS category, including completely normal scans, with children under 2 showing particularly strong potential. This connects directly to why the early neuroplasticity window matters so much, regardless of what a specific scan shows.

Want help understanding your own child’s specific MRI results?

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Frequently asked questions

What is an MRI, and is it safe?

Magnetic resonance imaging uses magnetic fields and radio waves, no radiation at all, unlike a CT scan, which is part of why it’s preferred for children. No metal can enter the scanning room.

Why does an MRI matter so much for CP?

It identifies exactly where and how the brain was affected, explaining a child’s specific movement pattern, and can help confirm or rule out other conditions occasionally confused with CP.

What should I expect during the scan?

It’s genuinely loud, takes 30-60 minutes or longer, requires complete stillness, and sedation or general anaesthesia is commonly used for younger children, meaning fasting instructions beforehand and recovery time after.

What is MRICS?

The MRI Classification System, standardising results into five groups: white matter injury (most common, 45-65%), grey matter injury, maldevelopments, miscellaneous findings, and normal findings.

Does a normal MRI mean my child doesn’t have CP?

No. Roughly 9 to 16% of children with confirmed CP have completely normal MRIs. A normal scan means the mechanism isn’t visible on imaging, not that the diagnosis is wrong.

Do specific findings predict severity?

General tendencies exist, not certainties: white matter injury links to somewhat better motor outcomes and lower intellectual disability rates; grey matter injury and maldevelopments link more to epilepsy, hearing loss, and greater overall impairment.

References

“The applicability of magnetic resonance imaging classification system (MRICS) for cerebral palsy.” PMC. PMC ↗
“MRI patterns and clinical outcomes in cerebral palsy: insights from a large MRICS-based cohort.” Journal of Neurodevelopmental Disorders. PMC ↗
“Spectrum of findings of magnetic resonance imaging of brain in cerebral palsy.” European Journal of Cardiovascular Medicine. Healthcare Bulletin ↗
“Clinical characteristics and rehabilitation potential in children with cerebral palsy based on MRI classification system.” PMC. PMC ↗

Medical disclaimer: This article is for informational purposes. Your child’s specific MRI findings should be reviewed and explained by their radiologist and treating physician directly.