Abstract
A 47-year-old, right-handed female with right thalamic hemorrhage presented with left-sided unilateral spatial neglect (USN). USN had disappeared about four months following an onset of the disease, but pseudo-simultanagnosia persisted. Brain CT scan disclosed a high density area located in the right thalamus, extending to the internal capsule laterally and to the third ventricle medially. These findings support a recent concept that a posteromedial portion of the right thalamus may play a major role for producing USN, and also suggest that posterior limb of the internal capsule may take part in USN occurrence. Disordered pursuit and saccadic eye movement toward the left side i. e. neglect side were noted throughout the follow-up period. The abnormal saccade may be considered as the result of damage of the saccade fiber system descending from the frontal eye field. On the other hand, there may be another explanation that visually-guided eye movement such as pursuit and saccade was impaired as the result of visual input deficit due to USN.
