Dominance specific visual extinction associated with callosal disconnection

Abstract

Callosal disconnection signs are closely related to asymmetric hemispheric specialization of cognitive functions. Although extinction is more commonly associated with the right parietotemporal lesion, it may occur following lesions of the corpus callosum. After an infarction involving the left splenium, a 58-year-old right-handed man had no disconnection symptoms that had been reported earlier, but showed visual extinction with left or right visual hemifield dominant stimuli. Our results suggest that dominance specific visual extinction might be another disconnection sign associated with splenial lesion.

Splenial Corpus Callosum Infarction Presenting with Unilateral Prosopometamorphopsia: A Case Report

“…Such dominant hemisphere-specific disconnection sign is characterized by the fact that neurologic abnormalities are observed in the ipsilateral side of the dominant hemisphere. 17 Further studies are needed to investigate the pathophysiologic mechanisms to understand how splenial lesion could cause unilateral prosopometamorphopsia.…”

Teaching Neuro Images : Unilateral prosopometamorphopsia as a dominant hemisphere-specific disconnection sign

“…Unilateral prosopometamorphopsia could be a dominant hemisphere-specific disconnection sign in which neurologic abnormalities are observed in the ipsilateral side of the dominant hemisphere. 1 Our cases provide additional evidence that the splenium of the corpus callosum interconnects visual cortices and the right hemisphere is dominant for integrating facial information. …”