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MRI and 18F-fluorodeoxyglucose positron emission tomography in hemimegalencephaly
K T Hoffmann1, H Amthauer, T Liebig
1Department of Radiology, Virchow-Klinikum, Charité, Humboldt-University, Berlin, Germany. karl-titus.hoffmann@charite.de
Abstract:
We report hemimegalencephaly in a 44-year-old woman with mental retardation, epilepsy and a mild hemiparesis. In addition to typical findings on MRI, 2-deoxy-2[18F]fluorodeoxyglucose positron-emission tomography (PET) demonstrated glucose hypometabolism of the affected hemisphere. The results of PET have been coregistered with morphological information from the MRI studies by image fusion.
Insights
Hemimegalencephaly, a rare brain malformation, was identified in a woman with intellectual disability and epilepsy. Positron-emission tomography (PET) revealed reduced glucose metabolism in the affected hemisphere, aiding diagnosis.
Area of Science:
- Neurology
- Neuroimaging
- Medical Diagnostics
Background:
- Hemimegalencephaly is a congenital brain malformation characterized by unilateral enlargement of the cerebral hemisphere.
- It is often associated with neurological deficits, including intellectual disability, epilepsy, and motor impairments.
- Accurate diagnosis and understanding of the underlying pathophysiology are crucial for patient management.
Observation:
- A 44-year-old woman presented with a history of mental retardation, epilepsy, and mild hemiparesis.
- Magnetic Resonance Imaging (MRI) revealed findings consistent with hemimegalencephaly.
- 2-deoxy-2[18F]fluorodeoxyglucose Positron-Emission Tomography (PET) was employed for functional assessment.
Findings:
- PET imaging demonstrated significant glucose hypometabolism in the hemisphere affected by hemimegalencephaly.
- This functional deficit correlated with the structural abnormalities observed on MRI.
- Image fusion of PET and MRI data provided a comprehensive view of both structural and metabolic changes.
Implications:
- Positron-emission tomography (PET) can effectively identify functional deficits in hemimegalencephaly, complementing structural MRI.
- The coregistration of PET and MRI data enhances diagnostic accuracy and aids in understanding the pathophysiology of neurological deficits.
- This integrated imaging approach may inform treatment strategies and prognostication for patients with hemimegalencephaly.