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MR in temporal lobe epilepsy: analysis with pathologic confirmation
1Department of Diagnostic Radiology, London Health Sciences Center, University of Western Ontario, Canada.
Purpose:
We evaluated the MR findings in patients with temporal lobe epilepsy to determine the predictive value of MR imaging in assessing patient outcome.
Methods:
MR studies from 186 of 274 consecutive patients who underwent temporal lobectomy for intractable epilepsy were reviewed retrospectively. Images were interpreted by an experienced neuroradiologist, who was blinded to the side of seizure activity and to pathologic findings.
Results:
MR imaging exhibited 93% sensitivity and 83% specificity in detecting hippocampal/amygdalar abnormalities (n = 121), and 97% sensitivity and 97% specificity in detecting abnormalities in the rest of the temporal lobe (n = 60). Abnormal high signal of the hippocampus on T2-weighted images had a sensitivity of 93% and specificity of 74% in predicting mesial temporal sclerosis (n = 115). The presence of hippocampal atrophy on MR correlated with the duration of seizures. Sensitivity and specificity of MR imaging in detecting temporal lobe tumors (n = 42) were 83% and 97%, respectively, based on abnormal signal and mass effect. After surgery, 63% of patients were seizure free and 28% had a significant reduction of seizure frequency at an average of 24 months (range, 12 to 78 months) after surgery. Patients with a single lesion in the anterior temporal lobe or hippocampus/amygdala had a better outcome than patients with multiple lesions (n = 22). Interrater agreement varied from 0.4 to 0.93, with best agreement for tumors or abnormal hippocampal signal on T2-weighted images.
Conclusion:
MR imaging is highly sensitive in detecting and locating abnormalities in the temporal lobe and the hippocampus/amygdala in patients with temporal lobe epilepsy. Hippocampal atrophy appears to correspond to the duration of seizure disorder.
Insights
Magnetic resonance (MR) imaging effectively detects temporal lobe abnormalities in epilepsy patients. Findings like hippocampal atrophy on MR scans can predict seizure duration and surgical outcomes.
Area of Science:
- Neurology
- Radiology
- Neurosurgery
Background:
- Temporal lobe epilepsy (TLE) is a common neurological disorder.
- Accurate diagnosis and outcome prediction are crucial for patient management.
- Magnetic resonance (MR) imaging plays a key role in evaluating brain abnormalities.
Purpose of the Study:
- To assess the predictive value of MR imaging findings in patients with temporal lobe epilepsy.
- To correlate MR imaging results with patient outcomes after temporal lobectomy.
Main Methods:
- Retrospective review of MR studies from 186 patients who underwent temporal lobectomy for intractable epilepsy.
- Experienced neuroradiologist interpreted MR images, blinded to clinical and pathological data.
- Analysis of sensitivity and specificity for detecting various temporal lobe abnormalities.
Main Results:
- MR imaging demonstrated high sensitivity and specificity in detecting hippocampal/amygdalar and other temporal lobe abnormalities.
- Abnormal hippocampal signal on T2-weighted images predicted mesial temporal sclerosis.
- Hippocampal atrophy correlated with seizure duration; MR detected temporal lobe tumors with high accuracy.
- Post-surgery, 63% of patients were seizure-free, and 28% had reduced seizure frequency.
- Single anterior temporal lobe or hippocampal/amygdalar lesions predicted better outcomes.
Conclusions:
- MR imaging is highly sensitive for detecting and localizing temporal lobe and hippocampal/amygdalar abnormalities in TLE.
- Hippocampal atrophy on MR imaging is associated with the duration of the seizure disorder.
- MR findings can aid in predicting patient outcomes following epilepsy surgery.