Transcortical sensory aphasia with Gerstmann's syndrome. Which stroke territory?

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Transcortical sensory aphasia with Gerstmann's syndrome. Which stroke territory?

Transcortical sensory aphasia happens when the posterior language cortex (the area around Wernicke’s) is disconnected from the rest of the language network, with repetition preserved because the arcuate fasciculus is spared. This pattern most often arises from a watershed infarct at the border between the left middle cerebral artery and posterior cerebral artery territories, which isolates the temporoparietal language region. Gerstmann’s syndrome—acalculia, agraphia, finger agnosia, and left–right disorientation—points to damage in the dominant angular gyrus of the inferior parietal lobule, a region supplied in part by the posterior circulation. When both the temporoparietal language area and the dominant angular gyrus are affected, the combination described fits a left MCA–PCA watershed stroke. Thus, the territory best accounting for transcortical sensory aphasia with Gerstmann’s syndrome is a left MCA–PCA border-zone infarct. Left MCA inferior stroke typically produces a nonfluent aphasia rather than TSA; a left PCA stroke alone can cause visual and parietal symptoms but doesn’t as reliably explain the language pattern seen with TSA; a right-hemisphere stroke would not produce这些 language deficits in a typical left-dominant brain.

Transcortical sensory aphasia happens when the posterior language cortex (the area around Wernicke’s) is disconnected from the rest of the language network, with repetition preserved because the arcuate fasciculus is spared. This pattern most often arises from a watershed infarct at the border between the left middle cerebral artery and posterior cerebral artery territories, which isolates the temporoparietal language region.

Gerstmann’s syndrome—acalculia, agraphia, finger agnosia, and left–right disorientation—points to damage in the dominant angular gyrus of the inferior parietal lobule, a region supplied in part by the posterior circulation. When both the temporoparietal language area and the dominant angular gyrus are affected, the combination described fits a left MCA–PCA watershed stroke.

Thus, the territory best accounting for transcortical sensory aphasia with Gerstmann’s syndrome is a left MCA–PCA border-zone infarct. Left MCA inferior stroke typically produces a nonfluent aphasia rather than TSA; a left PCA stroke alone can cause visual and parietal symptoms but doesn’t as reliably explain the language pattern seen with TSA; a right-hemisphere stroke would not produce这些 language deficits in a typical left-dominant brain.

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