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Nonrefractory temporal lobe epilepsy: 1.5-T MR imaging
F Triulzi1, M Franceschi, F Fazio
1Department of Bioimaging, University of Milano, Istituto Scientifico S. Raffaele, Italy.
Abstract:
Thirty-one patients with temporal lobe epilepsy (TLE) of mild to moderate severity, well controlled by pharmacotherapy (nonrefractory TLE), and with negative findings at computed tomography, were studied with magnetic resonance (MR) imaging at 1.5 T. Examination disclosed significant findings in 16 patients: mesial temporal abnormalities (n = 9), basitemporal abnormalities (n = 2), and alterations in frontoparietal white matter (n = 5). Coronal views and sequences with a 120-msec echo time (TE) depicted lesions in 16 patients; axial views depicted lesions in only nine of 16 patients; sequences with a 35-msec TE depicted lesions in only ten. These results underline the importance of screening with MR imaging in nonrefractory TLE patients and suggest that the MR imaging sequence of choice is a thin-section, coronal, T2-weighted sequence.
Insights
Magnetic resonance (MR) imaging is crucial for diagnosing nonrefractory temporal lobe epilepsy (TLE). Specific MR imaging sequences, particularly thin-section, coronal, T2-weighted views, are most effective in detecting abnormalities in these patients.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Temporal lobe epilepsy (TLE) is a common neurological disorder.
- Nonrefractory TLE is epilepsy that is well-controlled with medication.
- Computed tomography (CT) scans may not reveal abnormalities in some TLE cases.
Purpose of the Study:
- To evaluate the utility of magnetic resonance (MR) imaging in detecting abnormalities in patients with nonrefractory TLE.
- To identify the optimal MR imaging sequences for visualizing TLE-related lesions.
Main Methods:
- MR imaging was performed at 1.5 T on 31 patients with mild to moderate nonrefractory TLE and negative CT findings.
- Coronal, axial, and T2-weighted sequences with varying echo times (TE) were utilized.
- Lesion detection rates were compared across different imaging views and sequences.
Main Results:
- Significant MR imaging findings were observed in 16 out of 31 patients.
- Abnormalities included mesial temporal (n=9), basitemporal (n=2), and frontoparietal white matter (n=5) alterations.
- Thin-section, coronal, T2-weighted sequences with a 120-msec echo time were most effective, detecting lesions in all 16 positive cases.
Conclusions:
- MR imaging is an important diagnostic tool for patients with nonrefractory TLE, even with negative CT results.
- Thin-section, coronal, T2-weighted sequences are recommended for optimal lesion detection in TLE.
- Advanced MR imaging techniques can reveal subtle abnormalities missed by conventional methods.