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J Korean Neurol Assoc. 1997;15(2):382-387.
- Crossed aphasia in a dextral
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Yong Jin Jo, M.D., Kyu Hyun Park, M.D.
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Department of Neurology, College of Medicine, Pusan National University
- 교차성 실어증1례
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조용진, 박규현
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부산대학교 의대 신경과
- Abstract
- Crossed aphasia refers to a combination of aphasia and right hemiparesis in a left handed person or left hemiparesis and aphasia in a dextral. While crossed aphasia is not infrequent at all among left-handers, it remains an extremely rare event in dextrals. Its incidence is probably about 0.4% after right hemispheric lesions and prevalence is about 1% among right-handed aphasics. The neurobiological mechanisms of this phenomenon are unknown, and the neuropsychological correlations are only incompletely understood.
We report a case of crossed aphasia in a 61-year-old right-handed woman who
presented with sudden, severe global aphasia and left hemiplegia without any personal
or family history of left-handedness. Brain MR image clearly showed a right
hemispheric infarction in the territory of the right middle cerebral artery and brain
SPECT also displayed reduction of regional cerebral blood flow in the right hemisphere
sparing the left hemisphere. In this patient, cerebral dominance for speech seems to lay
in the right hemisphere, while dominance for limb praxis seems to lay in the left as
the patient did not develop right limb apraxia. This case provides evidence that
cerebral dominance for speech and handedness in dextrals can be dissociated. It also
suggests that crossed aphasia in a dextral may be severe and persisting.
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- 초록
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