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Journal of Child Neurology, Vol. 17, No. 4, 292-297 (2002)
DOI: 10.1177/088307380201700411

Interhemispheric Reorganization of Motor Hand Function to the Primary Motor Cortex Predicted With Functional Magnetic Resonance Imaging and Transcranial Magnetic Stimulation

Geert-Jan M. Rutten

Department of Neurosurgery, University Medical Center Utrecht, Utrecht, The Netherlands

Nick F. Ramsey

Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands

Peter C. Van Rijen

Department of Neurosurgery, University Medical Center Utrecht, Utrecht, The Netherlands

Hessel Franssen

Department of Clinical Neurophysiology, University Medical Center Utrecht, Utrecht, The Netherlands

Cees W. M. Van Veelen

Department of Neurosurgery, University Medical Center Utrecht, Utrecht, The Netherlands

The objective of this study was presurgical assessment of reorganization of motor hand function in an 11-year-old girl with intractable epilepsy and a right-sided hemiplegia resulting from an extensive perinatal left hemispheric stroke. Prior to a left functional hemispherectomy, functional magnetic resonance imaging (MRI) showed that both nonparetic and paretic motor hand function predominantly activated the right primary motor cortex, whereas no activation was found in the left hemisphere. Transcranial magnetic stimulation of the right central area yielded responses in both the nonparetic and the paretic hand, whereas no responses were obtained after stimulation of the affected hemisphere. Both techniques indicated that motor function was mediated by corticospinal fibers originating from the undamaged (primary) motor cortex and predicted no further loss of motor hand function after surgery. Indeed, subsequent functional hemispherectomy induced no new sensorimotor deficits. Functional MRI was repeated 22 months after surgery and matched preoperative sensorimotor functional MRI findings, confirming reorganization of the primary motor cortex. No additional reorganization was introduced by surgery. (J Child Neurol 2002;17:292-297).


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