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Published on: September 25, 2019
Correlation of MRI and histopathology in epileptogenic parietal and occipital lobe lesions
Horst Urbach1, Devin Binder, Marec von Lehe
1Department of Radiology, University of Bonn Medical Center, Bonn, Germany. urbach@uni-bonn.de
Introduction:
To analyze the diagnostic accuracy of MRI in patients undergoing parietal and occipital lobe epilepsy surgery.
Methods:
In a retrospective study, we analyzed MRI scans and neuropathology reports of 42 patients who had undergone resective epilepsy surgery in the parietal and occipital lobe between 1998 and 2003. We evaluated, whether lesions were precisely characterized by MRI and whether lesion characterization allowed to estimate postsurgical seizure outcome.
Results:
Within the categories epilepsy associated tumors, focal cortical dysplasias, vascular malformations, scarring, and others, MRI was concordant with histopathology in 36 of 42 (86%) lesions. Among the discordant lesions, one lesion was re-classified following MRI-histopathology synopsis, another two lesions represented new tumor entities (angiocentric neuroepithelial tumor, isomorphic astrocytoma) which have been described recently. Seizure freedom (Engel class I) one year following surgery was achieved in 25 patients (60%). Seizure outcome was different for lesion categories (Engel class I: epilepsy associated tumors, 62%; focal cortical dysplasias, 71%; vascular malformations, 75%; scarring, 40%), and was unchanged if no lesion was found on preoperative MRI.
Conclusion:
If MRI and histopathology are discordant, not only the MRI findings may be debatable. MRI lesion detection is important, since chance of seizure freedom is low if no lesion is detected.
Insights
Magnetic Resonance Imaging (MRI) accurately identified most lesions in epilepsy surgery patients. Accurate MRI detection is crucial for predicting seizure freedom after parietal and occipital lobe resections.
Area of Science:
- Neurosurgery
- Diagnostic Imaging
- Epileptology
Background:
- Parietal and occipital lobe epilepsy surgery requires precise pre-operative lesion characterization.
- Diagnostic accuracy of Magnetic Resonance Imaging (MRI) is critical for surgical planning and outcome prediction.
Purpose of the Study:
- To evaluate the diagnostic accuracy of MRI in identifying lesions in patients undergoing epilepsy surgery.
- To determine if MRI characterization of lesions correlates with postsurgical seizure outcomes.
Main Methods:
- Retrospective analysis of MRI scans and neuropathology reports from 42 patients who underwent parietal/occipital lobe epilepsy surgery (1998-2003).
- Evaluation of MRI concordance with histopathology and its relation to seizure freedom (Engel class I) one year post-surgery.
Main Results:
- MRI demonstrated concordance with histopathology in 86% of lesions.
- Seizure freedom was achieved in 60% of patients one year post-surgery.
- Seizure outcome varied by lesion type and was poorer when no lesion was detected on MRI.
Conclusions:
- MRI is a valuable tool for lesion detection in epilepsy surgery, with high concordance with histopathology.
- Accurate MRI detection of lesions is essential for improving the chances of seizure freedom.
- Discordant MRI findings warrant careful review, as they may indicate rare pathologies or diagnostic uncertainty.
