Gerstmann Syndrome Deconstructed by Cortical Stimulation

Gerstmann syndrome is a tetrad of finger agnosia, left-right disorientation, acalculia, and agraphia.1 It results from lesions affecting the left parietal lobe, specifically the angular gyrus.1,2 Because it often presents as an incomplete tetrad, it is possible that the 4 features may have separate (but adjacent or overlapping) anatomic localization. Here, we present a case in which functional mapping through electrical cortical stimulation (ECS) revealed spatial dispersion of the Gerstmann tetrad.

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