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Alexia without agraphia, hemianopia, or color-naming defect

A disconnection syndrome

Divisions of Neurology and Neurosurgery, Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire.

A patient with alexia without agraphia, hemianopia, or color-naming defect was found at operation to have a meningioma arising from the tentorium cerebelli that compressed the inferior aspect of the left temporal-occipital junction. It is presumed to have involved only the left ventral visual association cortex and its inferior outflow tracts to the angular gyrus. The input from the right occipital area also was disconnected from the visual language verbal association area by involvement of the ventral outflow of the splenium of the corpus callosum. Preservation of color naming and matching suggests that these functions are dependent on the integrity of more dorsal occipital association systems.

Requests for reprints should be addressed to Dr. Vincent, Division of Neurology, Department of Medicine, Dartmouth-Hitchcock Medical Center, Hanover, NH 03755.

Presented at the twenty-eighth annual meeting of the American Academy of Neurology, Toronto, Ontario, Canada, April 1976.

This study was supported in part by PHS grant MH 25621 and the Sandoz Foundation.