Related Experiment Videos
Intractable complex partial seizure: correlation of magnetic resonance imaging with pathology and
C F Dowd1, W P Dillon, N M Barbaro
1Department of Radiology, University of California, San Francisco 94143.
Abstract:
We prospectively analyzed MR studies of 32 patients with intractable complex partial seizures, who later underwent resection of EEG-proven seizure foci. Twenty-seven patients were imaged at 1.5, 4 at 0.35, and 1 at 0.5 Tesla. Correlation was obtained on all patients with EEG and surgical pathology. Of 19 patients with mesial temporal sclerosis (MTS), 13 exhibited an MR abnormality at the site of pathology as determined by EEG and surgery. Abnormalities included increased (8) or decreased (1) signal intensity, distortion of gray-white interface (1) and temporal lobe atrophy (3). Six patients had no abnormalities at the site of the diseased focus. MR was more sensitive in patients with other structural lesions which included tumor, encephalitis, polymicrogyria, cryptic vascular malformation, and tuberous sclerosis. Prior studies indicate some usefulness of MR in intractable seizure patients, but many report relative insensitivity of MR in defining an abnormality (as low as 11%). Our results demonstrate the usefulness of high-resolution thin-section multiplanar MR using cardiac gating or flow compensation techniques in this patient population.
Insights
Magnetic resonance imaging (MRI) can detect abnormalities in patients with complex partial seizures. High-resolution MRI techniques improve the detection of seizure foci, particularly in cases of mesial temporal sclerosis.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Intractable complex partial seizures often require surgical intervention.
- Accurate localization of seizure foci is crucial for successful epilepsy surgery.
- Magnetic resonance imaging (MRI) plays a role in pre-surgical evaluation, but its sensitivity varies.
Purpose of the Study:
- To prospectively evaluate the utility of MRI in identifying seizure foci in patients with intractable complex partial seizures.
- To assess the sensitivity of MRI in detecting abnormalities, particularly mesial temporal sclerosis (MTS).
- To determine if advanced MRI techniques enhance lesion detection.
Main Methods:
- Prospective analysis of MRI studies in 32 patients with intractable complex partial seizures.
- Patients underwent resection of EEG-proven seizure foci.
- MRI was performed at various field strengths (0.35, 0.5, and 1.5 Tesla).
- Correlation with electroencephalography (EEG) and surgical pathology was performed.
Main Results:
- Of 19 patients with mesial temporal sclerosis (MTS), 13 showed MRI abnormalities at the seizure focus.
- MRI abnormalities included signal intensity changes, gray-white interface distortion, and temporal lobe atrophy.
- MRI was more sensitive in detecting other structural lesions like tumors and vascular malformations.
- Six patients with MTS had no detectable MRI abnormalities at the diseased focus.
Conclusions:
- High-resolution, thin-section, multiplanar MRI with cardiac gating or flow compensation techniques improves the detection of seizure foci.
- Advanced MRI techniques are valuable in the pre-surgical evaluation of patients with intractable complex partial seizures.
- MRI sensitivity for detecting abnormalities, especially MTS, can be enhanced with optimized imaging protocols.