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March 1940

THE ELECTROENCEPHALOGRAM IN CASES OF NEOPLASMS OF THE POSTERIOR FOSSA

Author Affiliations

NEW YORK

From the Department of Neurology, Columbia University College of Physicians and Surgeons, and the Division of Child Neurology, Neurological Institute of New York.

Arch NeurPsych. 1940;43(3):472-487. doi:10.1001/archneurpsyc.1940.02280030046005
Abstract

It is now well established that the electroencephalogram may be used to advantage to locate cerebral lesions through the intact skull (Walter,1 Case and Bucy2 and Williams and Gibbs3). On the other hand, there is no evidence that deep-lying midline lesions may be localized by this technic, and subtentorial tumors similarly have been reported4 as not being amenable to localization by the electroencephalogram. More recently Walter1c has reported local pathologic alteration in a few cases of cerebellar tumor. The pathologic activity in each of these cases consisted of a focus of slow delta waves appearing "behind the mastoid process" and presumably localizing with respect to the side of the tumor. Additional evidence regarding tumors of the posterior fossa has arisen during our routine electroencephalographic observations on children with various neurologic disorders. Eight patients with neoplasms in this region have thus far been examined. In each

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