Localization in Transcortical Sensory Aphasia

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Abstract
• Transcortical sensory aphasia is a syndrome characterized by poor comprehension but excellent repetition. The lesions shown on computed tomography and isotope scans of 15 patients who satisfied the objective criteria based on test scores were studied. The overlap technique showed a unique posterior parieto-occipital location of the lesions. The lesions seem to separate into two groups: one is more medial, inferior, and posterior and is clearly in the posterior cerebral artery territory, and the other is relatively more lateral, superior, and anterior and seems to be in a watershed area between middle cerebral and posterior cerebral arteries. The lesion sizes correlated with severity. Frequent recovery and good prognosis are associated with this entity. Association with transient visual agnosia and hemianopsia confirmed the anatomical correlation.

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