For children whose seizures persist despite medication and whose brains appear unremarkable on standard scans, the search for a surgical solution has long been hampered by the limits of what imaging could reveal. A study of 79 young patients in Italy suggests that combining metabolic and structural brain imaging in a single session — PET/MRI — can illuminate what conventional scans leave in shadow, offering families and clinicians a more honest map of the brain and, for many children, a credible path toward freedom from seizures.
PET/MRI Imaging Improves Seizure Detection in Children With Hard-to-Diagnose Epilepsy
Children with difficult-to-diagnose focal epilepsy benefit from improved presurgical imaging, with 76% of surgically treated patients achieving seizure freedom after two years.
Three-quarters of surgically treated children were seizure-free after two years.
Mark
So this study looked at 79 children with seizures that weren't showing up on regular MRI. What exactly does PET/MRI do that regular MRI doesn't?
Mimi
Regular MRI shows you the structure of the brain—the anatomy, the shape, whether there are obvious lesions or abnormalities. PET shows you function—where the brain is using energy, where metabolism is high or low. When you combine them, you get both pictures at once, which can reveal problems that either method alone might miss.
Luke
But I want to be careful here. In this study, 46 out of 79 children had abnormalities on both PET and MRI. That's good concordance. But 24 had PET findings without MRI findings. How confident are we that those PET findings are actually the seizure source?
Mimi
That's exactly why they checked against EEG. When the PET/MRI results matched what the EEG was showing—the electrical activity of the seizures—that gave them confidence. The children who went to surgery were the ones where all three pieces of data lined up.
Mark
And the surgery worked for most of them?
Mimi
Yes. Seventy-six percent of the 29 children who had surgery were seizure-free two years later. That's a meaningful outcome for kids whose seizures weren't controlled by medication.
Luke
But we should note that this is a retrospective study of children who were already being evaluated for surgery. We don't know how this imaging would perform in a broader population of children with epilepsy, or what the false positive rate might be.
Mark
So it's not a cure-all.
Mimi
No. But for children where standard imaging has failed and surgery is being considered, it appears to offer real value in identifying which children are actually good candidates.
Luke
And the fact that it worked safely in very young children—under 6—that's important because imaging young children can be challenging.
Mimi
Exactly. That opens the door to earlier intervention in cases where surgery might help, rather than waiting years while medications fail.
O Pulso
- Uncontrolled focal epilepsy in children carries compounding costs — developmental disruption, injury risk, and the psychological weight of a life governed by unpredictability — and standard MRI scans were failing to find the cause in dozens of young patients.
- In 24 of 79 children, PET/MRI detected seizure-causing abnormalities that conventional MRI had missed entirely, exposing a critical diagnostic gap in the standard presurgical workup.
- The technique's power depended on convergence: when PET/MRI findings aligned with EEG recordings and clinical history, the accuracy of identifying the true seizure source rose sharply, guiding surgeons toward the right targets.
- Children whose imaging, electrical, and clinical data all pointed in different directions were identified as poor surgical candidates — a finding that protects as much as it disappoints, steering families away from high-risk procedures unlikely to help.
- Two years after surgery guided by this combined approach, 76 percent of the 29 treated children were seizure-free, a result that reframes PET/MRI not as a research curiosity but as a tool with immediate human consequence.
- The study's focus on children exclusively — including those under six — establishes that the technique is safe and reliable in young brains, strengthening the case for its wider adoption in pediatric epilepsy centers.
For children whose seizures persist despite medication and whose brains appear unremarkable on standard scans, the search for a surgical solution has long been hampered by the limits of what imaging could reveal. A study of 79 young patients in Italy suggests that combining metabolic and structural brain imaging in a single session — PET/MRI — can illuminate what conventional scans leave in shadow, offering families and clinicians a more honest map of the brain and, for many children, a credible path toward freedom from seizures.
For children whose seizures keep coming despite medication, and whose standard brain scans show nothing wrong, the path toward surgical treatment has always been uncertain. A study conducted at hospitals in Italy offers a clearer way forward.
Researchers enrolled 79 children and adolescents with focal epilepsy — seizures arising from a specific brain region — all of whom had already undergone standard MRI scans that returned negative or inconclusive results. The team tested whether PET/MRI, which captures both the brain's metabolic activity and its anatomical structure in a single imaging session, could find what conventional scans had missed. It could. Abnormalities appeared in 70 of the 79 children, and in 24 cases the PET component revealed areas of concern that MRI alone had completely overlooked.
The findings gained their real clinical value when cross-referenced with each child's EEG recordings and medical history. When all three sources of information pointed to the same brain region, the identification of the seizure source was reliable and surgical planning became possible. When the data scattered in different directions, surgery was less likely to help — and the study's framework helped clinicians recognize that distinction early.
Two distinct patterns emerged among children showing reduced brain metabolism. In one group, a closer look at MRI eventually uncovered structural lesions that had been missed on first reading. In the other, the metabolic signal was subtle and MRI remained inconclusive, making these children less suitable for surgery.
Of the 79 children, 29 underwent surgical or thermal treatment. Two years later, 76 percent were seizure-free. That figure carries weight beyond statistics: uncontrolled childhood epilepsy disrupts development, creates injury risk, and imposes a relentless psychological burden. For three-quarters of those treated, that burden lifted.
The study's particular contribution is its exclusive focus on pediatric patients, including children under six, demonstrating that PET/MRI is safe and effective even in very young brains. Researchers argue the technique deserves a standard place in presurgical evaluation — not as a last resort, but as a tool that gives families and clinicians a truer picture of what is happening, and a better chance of finding a way through.
For children whose seizures refuse to stop, the hunt for answers often leads to a dead end. Standard brain imaging shows nothing. Medications fail. The seizures keep coming. A new study suggests that a different kind of imaging—one that looks at both the structure and the function of the brain simultaneously—can find what conventional scans miss, and in doing so, can point the way toward surgery that actually works.
Researchers at hospitals in Italy studied 79 children and adolescents, all under 18, who had focal epilepsy—seizures originating from a specific area of the brain. All of them had already undergone standard MRI scans that came back either negative or unclear. All were being evaluated for possible surgery. The question was whether a combined PET/MRI scan, which captures both metabolic activity and anatomical structure in a single imaging session, could do better.
The answer was yes, but with important nuance. When radiologists and nuclear medicine physicians reviewed the PET/MRI images together, they found abnormalities in 70 of the 79 children. In 46 cases, both the PET scan and the MRI portion showed the same problem—a lesion or area of abnormal brain activity. But in 24 children, the PET scan lit up areas of concern that the MRI had completely missed. Eight children showed no abnormalities on either imaging modality. The combined approach revealed patterns that neither imaging method alone could capture.
The researchers then cross-checked these imaging findings against each child's EEG recordings and clinical history. When the PET/MRI results aligned with the electrical activity recorded on EEG, the accuracy in identifying the true source of seizures was high. This concordance mattered enormously for surgical planning. Children whose imaging, EEG, and clinical presentation all pointed to the same brain region were better candidates for surgery. Those whose results were scattered and contradictory were not.
The study identified two distinct groups of children with reduced brain metabolism—the kind of finding that can indicate a seizure focus. In one group, careful re-examination of the MRI scans eventually revealed structural abnormalities that had been missed on first reading. In the other group, the areas of abnormal metabolism were subtle, and even detailed review of the MRI found nothing conclusive. These second-group children were much less likely to have imaging, EEG, and clinical findings that all pointed the same direction, making them poorer candidates for surgery.
Of the 79 children in the study, 24 underwent surgical removal of brain tissue, and five underwent thermocoagulation, a procedure that destroys targeted tissue using heat. Two years after treatment, 76 percent of these 29 children were seizure-free. That outcome matters in a way that statistics alone cannot convey. Uncontrolled seizures in childhood carry real costs: injury risk, developmental disruption, medication side effects, and the psychological weight of unpredictability. For three-quarters of the children who underwent surgery guided by this imaging approach, that burden lifted.
What makes this study significant is not just the outcome but the population. Previous research on PET/MRI in epilepsy had mixed pediatric and adult patients, making it hard to know whether the technique worked equally well in younger brains. This study focused specifically on children, including some under 6 years old, and found the imaging safe and reliable even in this very young group. The researchers argue that as more data accumulate, PET/MRI could become a standard part of presurgical evaluation for children with focal epilepsy, helping clinicians identify which children are most likely to benefit from surgery and which should pursue other treatment paths. For now, it offers something that families of children with hard-to-diagnose seizures desperately need: a clearer picture of what is happening inside the brain, and a better chance of finding a path toward seizure freedom.
Citações Notáveis
PET/MRI can be used safely and reliably even in very young patients, and could help clinicians identify children most likely to benefit from epilepsy surgery.— Dr. Concetta Luisi, pediatric neurologist at Bambino Gesù Children's Hospital in Rome
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