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Published on: December 19, 2013
Focal cortical dysplasia: comparison of MRI and FDG-PET
1Department of Radiology, Samsung Medical Center, Sungkunkwan University School of Medicine, Seoul, Korea.
Purpose:
The purpose of this work was to compare the use of MRI and [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET) in the diagnosis of focal cortical dysplasia (FCD).
Method:
Nineteen patients with surgically proven FCD were analyzed retrospectively. MRI was performed in all patients, and FDG-PET was performed in 17 patients. We compared the MR and FDG-PET findings of FCD according to the histologic findings that were classified into three grades.
Results:
Four cases were classified as Grade I, 4 cases as Grade II, and 11 cases as Grade III FCD. The lesions were detected on MRI in 9 (82%) of the 11 patients with Grade III FCD and in only 1 (13%) of the 8 patients with Grade I and II FCD. Cortical hypometabolism of the lesion was revealed on FDG-PET in 6 (86%) of the 7 patients with Grade I and II FCD and in 9 (90%) of the 10 patients with Grade III FCD. The extent of the cortical abnormality was larger on FDG-PET than on MRI in 11 (65%) of the 17 patients.
Conclusion:
FDG-PET is more useful in delineating the cortical abnormality in patients with mild degrees of FCD. The extent of the lesion was larger or similar on FDG-PET compared with that of the MRI.
Insights
[18F]fluorodeoxyglucose (FDG) positron emission tomography (PET) is more effective than MRI for diagnosing mild focal cortical dysplasia (FCD). FDG-PET better delineates cortical abnormalities, especially in less severe FCD cases.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Focal cortical dysplasia (FCD) is a common cause of intractable epilepsy.
- Accurate diagnosis and delineation of FCD are crucial for surgical planning and patient outcomes.
- Magnetic resonance imaging (MRI) and [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET) are key imaging modalities in FCD evaluation.
Purpose of the Study:
- To compare the diagnostic utility of MRI and FDG-PET in identifying and characterizing focal cortical dysplasia (FCD).
- To assess the sensitivity of each modality across different grades of FCD severity.
Main Methods:
- Retrospective analysis of 19 patients with surgically confirmed FCD.
- Comparison of MRI findings with histological FCD grading (Grades I, II, III).
- Evaluation of FDG-PET findings in 17 of these patients, correlated with MRI and histology.
Main Results:
- MRI detected lesions in 82% of Grade III FCD cases but only 13% of Grade I and II cases.
- FDG-PET revealed cortical hypometabolism in 86% of Grade I/II FCD and 90% of Grade III FCD.
- FDG-PET demonstrated a larger extent of cortical abnormality than MRI in 65% of evaluated patients.
Conclusions:
- FDG-PET is superior to MRI in delineating cortical abnormalities, particularly in milder forms of FCD (Grade I and II).
- FDG-PET provides a more comprehensive assessment of lesion extent compared to MRI.
- Combined imaging may offer improved diagnostic accuracy for FCD.
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