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Peri-infarct reorganization in a patient with corona radiata infarct: a combined study of functional MRI and diffusion tensor image tractography.

Authors
Jang, SH; Ahn, SH; Ha, JS; Lee, SJ; Lee, J; Ahn, YH
Citation
Restorative neurology and neuroscience, 24(2):65-68, 2006
Journal Title
Restorative neurology and neuroscience
ISSN
0922-60281878-3627
Abstract
PURPOSE: We investigated the motor recovery mechanism of a stroke patient using functional MRI (fMRI) and diffusion tensor image tractography (DTT).



METHODS: A 60 year-old woman with right corona radiata infarct presented with complete paralysis of the left upper extremity. The motor function of the affected upper extremity recovered slowly for 6 months to a point of nearly normal function. The motor function of the patient was evaluated by fMRI and DTT at 6 months from the onset. FMRI was performed at 1.5 T with timed hand grasp-release movements. DTT was performed using 1.5 T with a synergy-L Sensitivity Encoding head coil. Three dimensional reconstructions of the fiber tracts were obtained with FA < 0.3, angle > 45 degrees as termination criteria.



RESULTS: The contralateral primary sensorimotor cortex (SM1) was activated during both affected (left) and unaffected hand movements. DTT showed that the tracts originated from either SM1; the tracts then descended along the known pathway of the corticospinal tract, with the exception that the tract of the affected (right) hemisphere descended along the posterior portion of the infarcted corona radiata.



CONCLUSIONS: It seems that the motor function of the affected upper extremity was reorganized to the posterior portion of the infarcted corona radiata. This finding may reflect functional reorganization of the motor pathway following corticospinal tract damage. This appears to be one motor recovery mechanism of subcortical infarct.
MeSH terms
AnimalsBrain Infarction/pathology*Brain Infarction/physiopathology*Brain MappingCerebral Cortex/blood supplyCerebral Cortex/pathologyDiffusion Magnetic Resonance Imaging*HumansMagnetic Resonance Imaging*MaleMiddle AgedPyramidal Tracts/blood supplyPyramidal Tracts/pathologyPyramidal Tracts/physiopathology
PMID
16720942
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Neurosurgery
AJOU Authors
안, 영환
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