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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
[Lateralization of the epileptogenic area by magnetic resonance imaging in temporal lobe epilepsy]
M C Sandmann1, E Rogacheski, S Mazer
1Departamento de Clínica Médica, Hospital N. Sra. das Graças, Curitiba, Brasil.
Abstract:
We studied 5 patients with medically refractory temporal lobe epilepsy using special methods of MRI, in order to localize the epileptogenic area. Coronal sequences were obtained with 5 mm sections from the posterior margin of the brainstem to the base of the frontal lobe using: "Inversion recovery T1" (TR = 2500 msec, TE = 26 msec, T1 = 600 msec) to analyse loss of internal structure and atrophy of the hippocampus, and morphology of the temporal lobe; and Spin-echo T2w (TR = 250 msec, TE = 120 msec) looking for abnormal high intensity signal. In two cases with left focal EEG the MRI showed atrophy, loss of internal structure and abnormal high intensity signal in the hippocampus, and atrophy of the anterior temporal lobe, ipsilaterally. One case with independent bilateral foci at the EEG showed atrophy, loss of internal structure and abnormal high intensity signal in the right hippocampus. Other case with right focal EEG showed bilateral atrophy of the anterior temporal lobes. Another case was normal. We conclude that this methodology can facilitate the surgical indication in temporal lobe epilepsy.
Insights
Special MRI methods helped identify the seizure-causing areas in patients with difficult-to-treat temporal lobe epilepsy. This imaging approach aids in surgical decision-making for epilepsy.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Context:
- Medically refractory temporal lobe epilepsy presents diagnostic challenges.
- Accurate localization of the epileptogenic zone is crucial for surgical treatment planning.
Purpose:
- To evaluate the utility of specific magnetic resonance imaging (MRI) sequences for localizing the epileptogenic area in patients with medically refractory temporal lobe epilepsy.
Summary:
- Five patients with refractory temporal lobe epilepsy underwent specialized MRI using Inversion Recovery T1 and Spin-Echo T2w sequences.
- MRI findings correlated with electroencephalography (EEG) in identifying hippocampal atrophy, loss of internal structure, and high-intensity signals, as well as temporal lobe atrophy.
- Abnormalities were observed ipsilaterally in two left focal epilepsy cases and in the right hippocampus of one bilateral focal epilepsy case.
Impact:
- This advanced MRI methodology can improve the identification of surgical candidates for temporal lobe epilepsy.
- Enhanced visualization of subtle hippocampal and temporal lobe changes aids in presurgical evaluation.
