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[Bilateral crossed visuomotor ataxia--a case report]
No to Shinkei = Brain and Nerve
|December 1, 1983
Summary
This study details a case of a splenium tumor causing bilateral crossed visuomotor ataxia and hemialexia. The findings explore potential mechanisms behind these complex neurological symptoms.
Area of Science:
- Neuroscience
- Neurology
- Neuro-oncology
Background:
- Splenium tumors, such as glioblastoma, can present with complex neurological deficits.
- Bilateral crossed visuomotor ataxia is a rare symptom requiring investigation into its underlying mechanisms.
Observation:
- A 55-year-old woman with a suspected splenium tumor exhibited bilateral crossed visuomotor ataxia.
- Tachistoscopic examinations revealed left unilateral hemialexia, while apraxia and agraphia were absent.
Findings:
- Three hypotheses for bilateral crossed visuomotor ataxia are proposed: callosal disconnection of fibers, impaired interhemispheric transfer of parieto-occipital information, and functional dissociation in visual processing.
- Callosal lesion is implicated, potentially affecting pathways for visual perception of movement versus position.
Implications:
- Understanding the mechanisms of crossed visuomotor ataxia aids in diagnosing and managing splenium tumors.
- Further research is needed to clarify the exact anatomical and patho-plastic mechanisms involved.