Related Experiment Video
Updated: May 29, 2026
Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
Published on: November 4, 2025
Morphometric MRI analysis improves detection of focal cortical dysplasia type II
Jan Wagner1, Bernd Weber, Horst Urbach
1Department of Epileptology, University of Bonn, D-53127 Bonn, Germany. jan.wagner@ukb.uni-bonn.de
Abstract:
Focal cortical dysplasias type II (FCD II) are highly epileptogenic lesions frequently causing pharmacoresistant epilepsy. Detection of these lesions on MRI is still challenging as FCDs may be very subtle in appearance and might escape conventional visual analysis. Morphometric MRI analysis is a voxel-based post-processing method based on algorithms of the statistical parametric mapping software (SPM5). It creates three dimensional feature maps highlighting brain areas with blurred grey-white matter junction and abnormal gyration, and thereby may help to detect FCD. In this study, we evaluated the potential diagnostic value of morphometric analysis as implemented in a morphometric analysis programme, compared with conventional visual analysis by an experienced neuroradiologist in 91 patients with histologically proven FCD II operated on at the University Hospital of Bonn between 2000 and 2010 (FCD IIa, n = 17; IIb, n = 74). All preoperative MRI scans were evaluated independently (i) based on conventional visual analysis by an experienced neuroradiologist and (ii) using morphometric analysis. Both evaluators had the same clinical information (electroencephalography and semiology), but were blinded to each other's results. The detection rate of FCD using morphometric analysis was superior to conventional visual analysis in the FCD IIa subgroup (82% versus 65%), while no difference was found in the FCD IIb subgroup (92% versus 91%). However, the combination of conventional visual analysis and morphometric analysis provided complementary information and detected 89 out of all 91 FCDs (98%). The combination was significantly superior to conventional visual analysis alone in both subgroups resulting in a higher diagnostic sensitivity (94% versus 65%, P = 0.031 for FCD IIa; 99% versus 91%, P = 0.016 for FCD IIb). In conclusion, the additional application of morphometric MRI analysis increases the diagnostic sensitivity for FCD II in comparison with conventional visual analysis alone. Since detection of FCDs on MRI during the presurgical evaluation markedly improves the chance of becoming seizure free postoperatively, we apply morphometric analysis in all patients who are MRI-negative after conventional visual analysis at our centre.
Insights
Morphometric MRI analysis improves detection of focal cortical dysplasia type II (FCD II) lesions, which cause difficult-to-treat epilepsy. Combining this advanced technique with standard visual MRI analysis significantly enhances diagnostic sensitivity for FCD II.
Area of Science:
- Neuroimaging
- Epileptology
- Neuroradiology
Background:
- Focal cortical dysplasias type II (FCD II) are a significant cause of drug-resistant epilepsy.
- Detecting subtle FCD II lesions on MRI remains a challenge for conventional visual analysis.
- Morphometric MRI analysis offers a quantitative approach to identify FCD II features.
Purpose of the Study:
- To evaluate the diagnostic value of morphometric MRI analysis compared to conventional visual analysis for FCD II.
- To assess the combined diagnostic performance of both methods in FCD II detection.
- To determine if morphometric analysis improves presurgical detection rates for FCD II.
Main Methods:
- Compared morphometric MRI analysis with conventional visual analysis in 91 FCD II patients.
- Used voxel-based post-processing with Statistical Parametric Mapping (SPM5) algorithms.
- Evaluated detection rates and diagnostic sensitivity for FCD IIa and FCD IIb subgroups.
Main Results:
- Morphometric analysis showed higher detection rates than visual analysis for FCD IIa (82% vs. 65%).
- Detection rates were similar for FCD IIb (92% vs. 91%) between methods.
- The combination of both methods detected 98% of all FCD II lesions, significantly improving sensitivity.
Conclusions:
- Additional morphometric MRI analysis enhances diagnostic sensitivity for FCD II compared to conventional visual analysis alone.
- Improved MRI detection of FCD II can increase the likelihood of seizure freedom after surgery.
- Morphometric analysis is applied to MRI-negative cases after conventional visual assessment at our center.
