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MRI-neuropathological correlations in type 1 lissencephaly
P Landrieu1, B Husson, D Pariente
1Department of Paediatric Neurology, CHU Bicêtre, France.
Abstract:
Although imperfect, MRI is the best way of distinguishing type 1 lissencephaly from other, less classical lissencephalic malformations. We reported a case in which correlation of MRI and neuropathology was possible. Besides the classical radiological features of lissencephaly, i.e., agyria and excessive thickness of the cortex, an additional sign was observed: a thin cortical band, which gave high signal on T2-weighted images, represented a paucicellular and partially myelinated band, 1500 microns thick, lying under the true superficial cortex. This MRI feature could be characteristic of the particular cortical lamination observed in true type 1 lissencephaly.
Insights
Magnetic Resonance Imaging (MRI) helps differentiate type 1 lissencephaly. A specific MRI finding, a thin, high-signal cortical band, may characterize this brain malformation.
Area of Science:
- Neurology
- Radiology
- Pathology
Background:
- Lissencephaly is a brain malformation characterized by smooth cerebral hemispheres.
- Distinguishing type 1 lissencephaly from other forms is crucial for diagnosis and management.
- Magnetic Resonance Imaging (MRI) is the primary diagnostic tool, though not always definitive.
Observation:
- A case study correlated MRI findings with neuropathology in a patient with type 1 lissencephaly.
- Classical MRI features include agyria and thickened cerebral cortex.
- An additional sign was identified: a thin band beneath the cortex with high signal on T2-weighted images.
Findings:
- Neuropathological examination revealed this band to be paucicellular and partially myelinated, approximately 1500 microns thick.
- This distinct band represents an abnormal cortical lamination.
- The observed MRI feature correlates with specific neuropathological findings in type 1 lissencephaly.
Implications:
- This MRI finding may serve as a characteristic marker for type 1 lissencephaly.
- Improved diagnostic accuracy can aid in patient management and genetic counseling.
- Further research can validate this sign in larger cohorts for definitive diagnosis.