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Jean Pelletier, MD; Michel Habib, MD; Olivier Lyon-Caen, MD; Georges Salamon, MD; Michel Poncet, MD; Richard Khalil, MD

Arch Neurol. 1993;50(10):1077-1082.

Abstract
• To investigate functional and anatomical features of callosal involvement in multiple sclerosis (MS), performances of 90 patients with definite MS and 25 matched normal control subjects were compared on three tasks exploring interhemispheric transfer of auditory, sensory, and motor information: a verbal dichotic listening task, a crossed tactile finger localization task, and an alternate finger tapping task. Each patient also underwent a magnetic resonance imaging (MRI) scan (1) to appreciate the extent of whitematter changes by a semiquantitative evaluation of hemispheric brain MRI hyperintensities and (2) to measure the degree of total and regional callosal atrophy using an automatized method of partition of the midsagittal callosal area. Interhemispheric transfer and/or integration was impaired in patients with MS for all modalities explored and proportional to both degree of callosal atrophy and diffusion of white-matter lesions. Moreover, in good agreement with data obtained from partial commissurotomy studies, performance on each functional task was predominantly associated with atrophy of one part of the callosum, namely left-ear dichotic suppression with the posterior callosal region, alternate finger tapping with the anterior region, and cross-localization with midanterior and posterior regions. Finally, a subgroup of patients without MRI white-matter hyperintensities also showed significant impairment of callosal function and relative atrophy of the callosum. These findings suggest the potential clinical value of callosal involvement in MS and the usefulness of MS as a model of interhemispheric disconnection.

Author Affiliations
From the Departments of Neurology (Drs Pel letier, Habib, Poncet, and Khalil) and Neuroradiology (Dr Salamon), University Hospital of Marseille; and the Department of Neurology, University Hospital of Paris (France) (Dr Lyon-Caen).

Footnotes
Accepted for publication January 29, 1993.

Reprint requests to Clinique de Neurologie, CHU Timone, F-13385 Marseille 5, France (Dr Habib).

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