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Temporal pole blurring in temporal lobe epilepsy revealed by 3D Edge-Enhancing Gradient Echo MRI
Lela Okromelidze1, Vivek Gupta1, Ayushi Jain1
1Department of Radiology, Mayo Clinic, Jacksonville, FL, USA.
Abstract:
While abnormalities of the hippocampus have been well characterized in temporal lobe epilepsy, various additional temporal lobe abnormalities have also been described. One poorly understood entity, the so-called temporal pole blurring (TPB), is one of the more frequently described neocortical abnormalities in TLE and is thought to represent dysmyelination and axonal loss due to chronic electrical perturbations in early age-onset temporal lobe epilepsy. In this study, we describe the first reported cases of TPB diagnosed by a recently described MRI sequence known as 3D Edge-Enhancing Gradient Echo (3D-EDGE), which has an effective "myelin weighting" making it exquisitely sensitive to this temporal pole dysmyelination. The value of detection of TPB lies in lateralizing seizure onset, as well as predicting a lower baseline neuropsychological performance compared to temporal lobe epilepsy without TPB. Additionally, it is critical to not mistake TPB for alternative diagnoses, such as focal cortical dysplasia or neoplasm.
Insights
Temporal pole blurring (TPB), a neocortical abnormality in temporal lobe epilepsy (TLE), is identified using a novel MRI technique. This finding aids in seizure onset localization and predicts neuropsychological outcomes.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Temporal lobe epilepsy (TLE) is often associated with hippocampal abnormalities.
- Neocortical abnormalities, including temporal pole blurring (TPB), are also observed in TLE.
- TPB is hypothesized to result from dysmyelination and axonal loss in early-onset TLE.
Purpose of the Study:
- To report the first cases of TPB diagnosed using the 3D Edge-Enhancing Gradient Echo (3D-EDGE) MRI sequence.
- To highlight the utility of 3D-EDGE MRI in detecting TPB due to its myelin-sensitive properties.
- To underscore the clinical significance of TPB in TLE management.
Main Methods:
- Utilized the 3D Edge-Enhancing Gradient Echo (3D-EDGE) MRI sequence.
- Focused on identifying temporal pole blurring (TPB) indicative of dysmyelination.
- Compared findings in TLE patients with and without TPB.
Main Results:
- Successfully diagnosed TPB using the 3D-EDGE MRI sequence.
- Demonstrated TPB's association with lateralizing seizure onset in TLE.
- Observed a correlation between TPB and lower baseline neuropsychological performance in TLE patients.
Conclusions:
- The 3D-EDGE MRI sequence is highly effective for detecting TPB.
- Identifying TPB is crucial for accurate seizure lateralization and predicting neuropsychological deficits in TLE.
- Distinguishing TPB from other temporal lobe abnormalities like focal cortical dysplasia or neoplasms is essential.
