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Clinical role of positron emission tomography in children with tuberous sclerosis complex
1Department of Pediatrics, Children's Hospital of Michigan, Wayne State University, School of Medicine, Detroit 48201, USA.
Insights
Positron emission tomography (PET) can offer additional information beyond CT and MRI for tuberous sclerosis complex (TSC) patients, particularly when considering surgery. However, its utility is limited in infants due to typically low brain metabolism.
Area of Science:
- Neurology
- Pediatric Neurology
- Medical Imaging
Background:
- Tuberous sclerosis complex (TSC) is a genetic disorder affecting multiple organs, often leading to neurological complications like epilepsy and developmental delay.
- Positron emission tomography (PET) is an imaging technique that measures metabolic activity in the brain.
- Evaluating the role of PET in pediatric TSC patients is crucial for understanding its diagnostic and localizing capabilities.
Purpose of the Study:
- To assess the clinical utility of fluorodeoxyglucose-positron emission tomography (FDG-PET) in identifying brain abnormalities in children with tuberous sclerosis complex (TSC).
- To compare PET findings with computed tomography (CT), magnetic resonance imaging (MRI), and electroencephalogram (EEG) in this patient cohort.
- To determine if PET provides supplementary information for surgical planning in TSC patients.
Main Methods:
- Twenty-three children diagnosed with TSC underwent PET scans, with data analyzed visually.
- PET findings were correlated with existing CT, MRI, and EEG results.
- Patient demographics, including age at scanning and seizure onset, were recorded.
Main Results:
- Twenty-one out of 23 children exhibited focal or multifocal cortical hypometabolism on PET scans.
- PET identified hypometabolic regions not apparent on CT or MRI, potentially related to epileptogenic zones or small tubers.
- Two infants scanned under one year of age showed normal PET results, suggesting potential false negatives in this age group.
Conclusions:
- PET imaging offers valuable additional localizing information in tuberous sclerosis complex (TSC) patients when compared to CT and MRI.
- The effectiveness of glucose metabolism PET is limited in infants due to naturally low cerebral glucose metabolism, potentially leading to false negatives before approximately one year of age.
- PET may be particularly useful in cases where EEG, CT, and MRI findings are unifocal or unilateral, aiding in surgical considerations by assessing contralateral tubers and overall brain functional integrity.
Abstract:
We evaluated the clinical role of positron emission tomography (PET) in 23 children with tuberous sclerosis complex. Mean age of the children when first scanned was 3.3 years. Mean age when seizures began was 8.7 months. All, except three, were at least mildly developmentally delayed. PET images were visually analyzed and compared to computed tomography (CT), magnetic resonance imaging (MRI), and the electroencephalogram (EEG). In two infants, interictal PET study was normal. One of the studies was performed with a low resolution early generation scanner at age 7 months; the other infant was 2 days old. Twenty-one of the 23 children had focal or multifocal cortical hypometabolism. Some hypometabolic cortical regions on PET did not show corresponding abnormalities on CT and MRI, and may be due to epileptogenic mechanisms or small tubers. PET provides additional localizing information to CT and MRI in patients with tuberous sclerosis complex. However, because of the normally low cerebral glucose metabolism in infancy, PET may give false negative findings if performed prior to about 1 year of age. The usefulness of glucose metabolism PET in most patients with tuberous sclerosis complex is limited. However, if the EEG, CT, and MRI abnormalities are unifocal or unilateral, and surgery is being contemplated, more detailed evaluation with PET may help to determine if contralateral tubers are present and evaluate the functional integrity of the brain as a whole.